Since the night he made an ill-advised decision to commit a pair of revenge killings, Nick has made his living as a professional murderer. Early on, he dispensed with guilt or emotion. But after a routine hit gets messy, Nick gets sick and the conscience he thought he'd killed, along with dozens of other marks, comes creeping back into his brain.Now Nick's profession and life are on the line, and he has begun stalking a perfectly innocent couple to...