by Dean Koontz
Koontz is a terrific what-if storyteller. Here the what-if premise is this: A homebody mystery writer has a serial-killer doppelganger with a souped-up metabolism and a telepathic brain—and the killer blames the writer for usurping "his" identity. The writer can run, but he and his strong wife and perky daughters can't hide. Despite some bioengineering mumbo jumbo, the narrative pace is breathless. (Putnam, $23.95)
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