"There's the unease everyone feels around us, but I can't feel that," Corwin explains. "I suppose if they're stitched up and I saw a seam, or they're like me and the leak blackness if they get upset or distracted and I saw that. But that would mean they weren't being careful. I could look for people who were sunglasses even indoors or at night, but that could be anything, really. So it's mostly a lot of small things that might, if I'm lucky, add up to someone being like me. Aha, found it!"

He pulls the book out from under a stack of other books, and papers, and a corked flask of something that looks like sludgy mud.