G. H. Ephron's gripping crime novels deal with fascinating psychological symptoms at work in the minds of murderers and their targets. In Obsessed , forensic neuropsychologist and expert defense witness Peter Zak is trying to help a coworker, Dr. Emily Ryan, who is being tormented by a stalker. She doesn't have any idea who it could be, and his acts have been escalating, to the point where he's breaking into her car and leaving sick messages. Peter...