Archangel (A Ghosts of London Novel)

Read Archangel (A Ghosts of London Novel) Storyline:

150 years apart, two men are attacked and killed in exactly the same part of exactly the same church. The only thing linking the incidents is the fact that in both cases, eyewitnesses reported seeing an angel. And although he's familiar with many of London's more bizarre inhabitants, Robinson is certain of one thing: angels aren't real. But if that's the case, how did one attack a tube train?