THE CLIENT: Blonde Edna Hammer, worried about her uncle, Peter Kent, who walked in his sleep with a carving knife in his hand. Is a man who walks in his sleep criminally responsible for what he does while sleepwalking? Edna wondered... So did Perry...
Lest we give you an unfair advantage or send you off on a false scent, we tell you nothing about this story in advance except that the clues go back over three hundred years in one of the most ingenious deductive problems that ever confronted a...