With such compelling and provocative novels as Red Planet Blues, FlashForward and The WWW Trilogy, Robert J. Sawyer has proven himself to be "a writer of boundless confidence and bold scientific extrapolation" (New York Times). Now, the Hugo and Nebula Award-winning author explores the thin line between good and evil that every human being is capable of crossing ... Experimental psychologist Jim Marchuk has developed a flawless technique for identifying the previously undetected psychopaths lurking everywhere in society. But while being cross-examined about his breakthrough in court, Jim is shocked to discover that he has lost his memories of six months of his life from twenty years previously - a dark time during which he himself committed heinous acts.
