Cascade Point

by Timothy Zahn

  Don't get me wrong; I have nothing against passengers aboard my ship. As a matter of fact, putting extra cabins in the Dancer had been my idea to start with, and they'd all too often made the difference between profit and loss in our always marginal business. But one of the reasons I had gone into space in the first place was to avoid having to make small talk with strangers, and I would rather solo through four cascade points in a row than spend those agonizing minutes at the entry portal. In this case, though, I had no choice. Tobbar, our master of drivel— and thus the man unofficially in charge of civilian small talk—was up to his elbows in grease and balky hydraulics; and my second choice, Alana Keal, had finally gotten through to an equally balky tower controller who wanted to bump us ten ships back in the lift pattern. Which left exactly one person—me—because there was no one else I'd trust with giving a good first impression of my ship to paying customers. And so I was the one standing on the ramp when Bradley and his eleven fellow passengers hoved into sight.

  They ranged from semiscruffy to respectable-but-not-rich—about par for the Dancer—but even in such a diverse group Bradley stood out like a red light on the status board. He was reasonably good-looking, reasonably average in height and build; but there was something in the way he walked that immediately caught my attention. Sort of a cross between nervous fear and something I couldn't help but identify as swagger. The mix was so good that it was several seconds before it occurred to me how mutually contradictory the two impressions were, and the realization left me feeling more uncomfortable than I already did.

  Bradley was eighth in line, with the result that my first seven greetings were carried out without a lot of attention from my conscious mind—which I'm sure only helped. Even standing still, I quickly discovered, Bradley's strangeness made itself apparent, both in his posture and also in his face and eyes. Especially his eyes.

  Finally it was his turn at the head of the line. "Good morning, sir," I said, shaking his hand. "I'm Captain Pall Durriken. Welcome aboard."

  "Thank you." His voice was bravely uncertain, the sort my mother used to describe as mousy. His eyes flicked the length of the Dancer, darted once into the portal, and returned to my face. "How often do ships like this crash?" he asked.

  I hadn't expected any questions quite so blunt, but the fact that it was outside the realm of small talk made it easy to handle. "Hardly ever," I told him. "The last published figures showed a death rate of less than one per million passengers. You're more likely to be hit by a chunk of roof tile off the tower over there."

  He actually cringed, turning halfway around to look at the tower. I hadn't dreamed he would take my comment so seriously, but before I could get my mouth working the man behind Bradley clapped a reassuring hand on his shoulder. "It's all right, Rik—nothing's going to hurt you. Really. This is a good ship, and we're going to be perfectly safe aboard her."

  Bradley slowly straightened, and the other man shifted his attention to me. "I'm Dr. Hammerfeld Lanton, Captain," he said, extending his hand. This is Rik Bradley. We're traveling in adjoining cabins."

  "Of course," I said, nodding as if I'd already known that. In reality I hadn't had time to check out the passenger lists and assignments, but I could trust Leeds to have set things up properly. "Are you a doctor of medicine, sir?"

  "In a way," Lanton said. "I'm a psychiatrist."

  "Ah," I said, and managed two or three equally brilliant conversational gems before the two of them moved on. The last three passengers I dispatched with similar polish, and when everyone was inside I sealed the portal and headed for the bridge.

  Alana had finished dickering with the tower and was running the prelift computer check when I arrived. "What's the verdict?" I asked as I slid into my chair and keyed for helm check.

  "We've still got our lift slot," she said. "That's conditional on Matope getting the elevon system working within the next half hour, of course."

  "Idiots," I muttered. The elevons wouldn't be needed until we arrived at Taimyr some six weeks from now, and Matope could practically rebuild them from scratch in that amount of time. To insist they be in prime condition before we could lift was unreasonable even for bureaucrats.

  "Oh, there's no problem—Tobbar reported they were closing things up a few minutes ago. They'll put it through its paces, it'll work perfectly, they'll transmit the readout, and that'll be that." She cleared her throat. "Incidentally... are you aware we've got a skull-diver and his patient aboard?"

  "Yes; I met—patient?" I interrupted myself as the last part of her sentence registered. "Who?"

  "Name's Bradley," she said. "No further data on him, but apparently he and this Lanton character had a fair amount of electronic and medical stuff delivered to their cabins."

  A small shiver ran up my back as I remembered Bradley's face. No wonder he'd struck me as strange. "No mention at all of what's wrong—of why Bradley needs a psychiatrist?"

  "Nothing. But it can't be anything serious." The test board bleeped, and Alana paused to peer at the results. Apparently satisfied, she keyed in the next test on the check list. "The Swedish Psychiatric Institute seems to be funding the trip, and they presumably know the regulations about notifying us of potential health risks." "Um." On the other hand, a small voice whispered in my ear, if there was some problem with Bradley that made him marginal for space certification, they were more likely to get away with slipping him aboard a tramp than on a liner. "Maybe I should give them a call, anyway. Unless you'd like to?"

  I glanced over in time to see her face go stony. "No, thank you," she said firmly.

  "Right." I felt ashamed of the comment, not really having meant it the way it had come out. All of us had our own reasons for being where we were; Alana's was an overdose of third-degree emotional burns. She was the type who'd seemingly been born to nurse broken wings and bruised souls, the type who by necessity kept her own heart in full view of both friends and passersby. Eventually, I gathered, one too many of her mended souls had torn out the emotional IVs she'd set up and flown off without so much as a backward glance, and she had renounced the whole business and run off to space. Ice to Europa, I'd thought once; there were enough broken wings out here for a whole shipload of Florence Nightingales. But what I'd expected to be a short vacation for her had become four years' worth of armor plate over her emotions, until I wasn't sure she even knew anymore how to care for people. The last thing in the universe she would be interested in doing would be getting involved in any way with Bradley's problems. "Is all the cargo aboard now?" I asked, to change the subject.

  "Yes, and Wilkinson certifies it's properly stowed."

  "Good." I got to my feet. "I guess I'll make a quick spot survey of the ship, if you can handle things here."

  "Go ahead," she said, not bothering to look up. Nodding anyway, I left.

  I stopped first at the service shafts where Matope and Tobbar were just starting their elevon tests, staying long enough to satisfy myself the resulting data were adequate to please even the tower's bit-pickers. Then it was to each of the cargo holds to double-check Wilkinson's stowing arrangement, to the passenger area to make sure all their luggage had been properly brought on board, to the computer room to look into a reported malfunction—a false alarm, fortunately— and finally back to the bridge for the lift itself. Somehow, in all the running around, I never got around to calling Sweden. Not, as I found out later, that it would have done me any good.

  —

  We lifted right on schedule, shifting from the launch fields grav booster to ramjet at ten kilometers and kicking in the fusion drive as soon as it was legal to do so. Six hours later we were past Luna's orbit and ready for the first cascade maneuver.

  Leeds checked in first, reporting officially that the proper number of dosages had been drawn from the sleeper cabinet and were being distributed to the passengers. Pascal gave the okay from the computer room, Matope from the engine room, and Sarojis from the small chamber housing the field generator itself. I had just pul
led a hard copy of the computer's course instructions when Leeds called back. "Captain, I'm in Dr. Lanton's cabin," he said without preamble. "Both he and Mr. Bradley refuse to take their sleepers."

  Alana turned at that, and I could read my own thought in her face: Lanton and Bradley had to be nuts. "Has Dr. Epstein explained the reasons behind the procedure?" I asked carefully, mindful of both my responsibilities and my limits here.

  "Yes, I have," Kate Epsteins clear soprano came. "Dr. Lanton says that his work requires both of them to stay awake through the cascade point."

  "Work? What sort of work?"

  A pause, and Lanton's voice replaced Kate's. "Captain, this is Dr. Lanton. Rik and I are involved in an experimental type of therapy here. The personal details are confidential, but I assure you that it presents no danger either to us or to you."

  Therapy. Great. I could feel anger starting to churn in my gut at Lanton's casual arrogance in neglecting to inform me ahead of time that he had more than transport in mind for my ship. By all rights I should freeze the countdown and sit Lanton down in a corner somewhere until I was convinced everything was as safe as he said. But time was money in this business; and if Lanton was glossing things over he could probably do so in finer detail than I could catch him on, anyway. "Mr. Bradley?" I called. "You agree to pass up your sleeper, as well?"

  "Yes, sir," came the mousy voice.

  "All right. Dr. Epstein, you and Mr. Leeds can go ahead and finish your rounds."

  "Well," Alana said as I flipped off the intercom, "at least if something goes wrong the record will clear us of any fault at the inquest."

  "You're a genuine ray of sunshine," I told her sourly. "What else could I have done?"

  "Baked Lanton over the coals for some information. We're at least entitled to know what's going on."

  "Oh, we'll find out, all right. As soon as we're through the point I'm going to haul Lanton up here for a long, cozy chat." I checked the readouts, cascade point in seventeen minutes. "Look, you might as well go to your cabin and hit the sack. I know it's your turn, but you were up late with that spare parts delivery and you're due some downtime."

  She hesitated; wanting to accept, no doubt, but slowed by considerations of duty. "Well... all right. I'm taking the next one, then. I don't know, though; maybe you shouldn't be up here alone. In case Lanton's miscalculated." "You mean if Bradley goes berserk or something?" That thought had been lurking in my mind, too, though it sounded rather ridiculous when spoken out loud. Still... "I can lower the pressure in the passenger deck corridor to half an atmosphere. That'll be enough to lock the doors without triggering any vacuum alarms."

  "Leaves Lanton on his own in case of trouble... but I suppose that's okay."

  "He's the one who's so sure it's safe. Go on, now—get out of here."

  She nodded and headed for the door. She paused there, though, her hand resting on the release. "Don't just haul Lanton away from Bradley when you want to talk to him," she called back over her shoulder. "Try to run into him in the lounge or somewhere instead when he's already alone. It might be hard on Bradley to know you two were off somewhere together talking about him." She slapped the release, almost viciously, and was gone.

  I stared after her for a long minute, wondering if I'd actually seen a crack in that heavy armor plate. The bleep of the intercom brought me back to the task at hand, Kate telling me the passengers were all down and that she, Leeds, and Wilkinson had taken their own sleepers. One by one the other six crewers also checked in. Within ten minutes they would be asleep, and I would be in sole charge of my ship.

  Twelve minutes to go. Even with the Dancer's old manual setup there was little that needed to be done. I laid the hard copy of the computer's instructions where it would be legible but not in the way, shut down all the external sensors and control surfaces, and put the computer and other electronic equipment into neutral/standby mode. The artificial gravity I left on; I'd tried a cascade point without it once and would never do so again. Then I waited, trying not to think of what was coming... and at the appropriate time I lifted the safety cover and twisted the field generator control knob.

  And suddenly there were five of us in the room.

  I will never understand how the first person to test the Colloton Drive ever made it past this point. The images silently surrounding me a bare arm's length away were lifesize, lifelike, and—at first glance, anyway—as solid as the panels and chairs they seemed to have displaced. It took a careful look to realize they were actually slightly transparent, like some kind of colored glass, and a little experimentation at that point would show they had less substance than air. They were nothing but ghosts, specters straight out of childhoods scariest stories. Which merely added to the discomfort... because all of them were me.

  Five seconds later the second set of images appeared, perfectly aligned with the first. After that they came more and more quickly, as the spacing between them similarly decreased, forming an ever-expanding horizontal cross with me at the center. I watched—forced myself to watch—knew I had to watch—as the lines continued to lengthen, watched until they were so long that I could no longer discern whether any more were being added. I took a long, shuddering breath—peripherally aware that the images nearest me were doing the same—and wiped a shaking hand across my forehead. You don't have to look, I told myself, eyes rigidly fixed on the back of the image in front of me. You've seen it all before. What's the point? But I'd fought this fight before, and I knew in advance I would lose. There was indeed no more point to it than there was to pressing a bruise, but it held an equal degree of compulsion. Bracing myself, I turned my head and gazed down the line of images strung out to my left.

  The armchair philosophers may still quibble over what the cascade point images "really" are, but those of us who fly the small ships figured it out long ago. The Colloton field puts us into a different type of space, possibly an entire universe worth of it—that much is established fact. Somehow this space links us into a set of alternate realities, universes that might have been if things had gone differently... and what I was therefore seeing around me were images of what I would be doing in each of those universes.

  Sure, the theory has problems. Obviously, I should generate a separate pseudoreality every time I choose ham instead of turkey for lunch, and just as obviously such trivial changes don't make it into the pattern. Only the four images closest to me are ever exactly my doubles; even the next ones in line are noticeably if subtly different. But it's not a matter of subconscious suggestion, either. Too many of the images are... unexpected... for that.

  It was no great feat to locate the images I particularly needed to see: the white-and-gold liner captain's uniforms stood out brilliantly among the more dingy jumpsuits and coveralls on either side. Liner captain. In charge of a fully equipped, fully modernized ship; treated with the respect and admiration such a position brought. It could have been—should have been. And to make things worse, I knew the precise decision that had lost it to me.

  It had been eight years now since the uniforms had appeared among my cascade images; ten since the day I'd thrown Lord Hendrik's son off the bridge of the training ship and simultaneously guaranteed myself a blackballing with every major company in the business. Could I have handled the situation differently? Probably. Should I have? Given the state of the art then, no. A man who, after three training missions, still went borderline claustrophobic every time he had to stay awake through a cascade point had no business aboard a ship, let alone on its bridge. Hendrik might have forgiven me once he thought things through. The kid, who was forced into a ground position with the firm, never did. Eventually, of course, he took over the business.

  I had no way of knowing that four years later the Aker-Ming Autotorque would eliminate the need for anyone to stay awake through cascade maneuvers. I doubt seriously the kid appreciated the irony of it all.

  In the eight years since the liner captain uniforms had appeared they had been gradually moving away f
rom me along all four arms of the cross. Five more years, I estimated, and they would be far enough down the line to disappear into the mass of images crowded together out there. Whether my reaction to that event would be relief or sadness I didn't yet know, but there was no doubt in my mind that it would in some way be the end of a chapter in my life. I gazed at the figures for another minute... and then, with my ritual squeezing of the bruise accomplished, I let my eyes drift up and down the rest of the line.

  They were unremarkable, for the most part: minor variations in my appearance or clothing. The handful that had once showed me in some nonspacing job had long since vanished toward infinity; I'd been out here a long time. Perhaps too long... a thought the half-dozen or so gaps in each arm of the pattern underlined with unnecessary force. I'd told Bradley that ships like the Dancer rarely crashed, a perfectly true statement; but what I hadn't mentioned was that the chances of simply disappearing en route were something rather higher. None of us liked to think about that, especially during critical operations like cascade point maneuvers. But the gaps in the image pattern were a continual reminder that people still died in space. In six possible realities, apparently, I'd made a decision that killed me.

  Taking another deep breath, I forced all of that as far from my mind as I could and activated the Dancer's flywheel.

  Even on the bridge the hum was audible as the massive chunk of metal began to spin. A minute later it had reached its top speed... and the entire ship's counter- rotation began to register on the gyroscope set behind glass in the ceiling above my head. The device looked out of place, a decided anachronism among the modern instruments, control circuits, and readouts filling the bridge. But using it was the only way a ship our size could find its way safely through a cascade point. The enhanced electron tunneling effect that fouled up electronic instrument performance was well understood; what was still needed was a way to predict the precise effect a given cascade point rotation would generate. Without such predictability, readings couldn't even be given adjustment factors. Cascade navigation thus had to fall back on gross electrical and purely mechanical systems: flywheel, physical gyroscope, simple on-off controls, and a nonelectronic decision maker. Me. Slowly, the long needle above me crept around its dial. I watched its reflection carefully in the magnifying mirror, a system that allowed me to see the indicator without having to break my neck looking up over my shoulder. Around me, the cascade images did their own slow dance, a strange kaleidoscopic thing that moved the images and gaps around within each branch of the cross, while the branches themselves remained stationary relative to me. The effect was unexplained; but then, Colloton field theory left a lot of things unexplained. Mathematically, the basic idea was relatively straightforward: the space we were in right now could be described by a type of bilinear conformal mapping— specifically, a conjugate inversion that maps lines into circles. From that point it was all downhill, the details tangling into a soup of singularities, branch points, and confluent Riemann surfaces; but what it all eventually boiled down to was that a yaw rotation of the ship here would become a linear translation when I shut down the field generator and we reentered normal space. The Dancer's rotation was coming up on two degrees now, which for the particular configuration we were in meant we were already about half a light-year closer to our destination. Another—I checked the printout—one point three six and I would shut down the flywheel, letting the Dancer's momentum carry her an extra point two degree for a grand total of eight light-years.