A young woman's remains are found in such a way that suggest the killer is a S&M fetishist, but further developments make Tony suspicious about what is truly going on.
Continuing the investigation into the discovery of a burial site that holds more than one victim of violent and possibly sadio-masochistic killings, the focus shifts to the investigation team itself when one of them disappears.
Tony, speaking at a convention on experimental psychology, becomes the prime suspect when a fellow delegate is brutally murdered in her hotel room. Alex, meanwhile, investigates a series of murders of street prostitutes.
Tony, suspected of the involvement in the murder of two psychologists, is desperate to prove his innocence. Some lateral thinking leads him to a connection between those deaths and the prostitute murders.
Young men are being kidnapped and later turn up dead - beaten, stabbed, shot. Tony is called in to help clarify motive and establish links between the victims. Elsewhere, against Tony's advice, an extremely dangerous prisoner has claimed religious salvation and is given more privileges.
While working on solving the disappearance of young men, a young mother goes missing, adding another piece to the puzzle. In addition, the escape of a prisoner places Tony's life at risk.
Homeless men are found dead and arranged in various ways with specific items left at each scene. And, Tony is being stalked by someone using a series of strange "gifts."
Tony puts together the clues to solve the mystery of the ritualistic killings of the homeless men. He also tries to deal with the reality that the man who has targeted him is extremely clever, resourceful, and unlikely to give up.