Read Ingenious Pain Storyline:
An 18th Century English surgeon is born immune to pain, making him oblivious to the suffering of others. This accounts for his professional success which attracts the attention of the Empress of Russia. On the way to treat her, he runs into a witch who gives him the sensation of pain. That sends him mad but he recovers, emerging from the asylum with the knowledge that without pain one is not really humanPages of Ingenious Pain :
