Up until now, the only serial killers Tony Hill had encountered were safely behind bars. This one's different - this one's on the loose. Four men have been found mutilated and tortured. As fear grips the city, the police turn to clinical psychologist Tony Hill for a profile of the killer. But soon Tony becomes the unsuspecting target in a battle of wits and wills, where he has to use every ounce of his professional nerve to survive.