He had always struggled with it: deja vu - that unsettling feeling that something you are experiencing right now has actually happened in every detail some time in your own past. You can't anticipate it; you are minding your own business when suddenly you have a powerful, inexplicable sensation that you remember this moment, or the angle of the sunlight, or the smell of a specific perfume. But in Baxter's case, this troubling experience occurred so often that it happened not only in waking moments, but it also invaded his dreams; nearly every night he had the same dream, and within that...