Philadelphia has been plagued by a serial killer dubbed the Plate Glass Killer by the media…until the police finally catch a break: Henry Tyder, the scion of a prominent Main Line family, is found literally with blood on his hands at the scene of the most recent murder. After more than a year of anguish, the city can now rest assured.But even though Tyder has made a confession, his own attorney has doubts. How could the alcoholic, frequently homeless Tyder have committed this crime—as well as the others? Enter Gregor Demarkian, retired head of the FBI’s Behavioral Sciences Unit, who’s been asked to look into the case. Gregor’s evaluation of Tyder turns up a grim truth: The police have got the wrong guy. But why would Tyder lie? Who is he trying to protect? If wrestling with this case weren’t enough, Gregor is still trying to make sense of the mysterious reappearance of his estranged girlfriend…and keep them all out of harm’s way while the real Plate Glass Killer remains at-large.