Herman Rockefeller was a multimillionaire, devoted husband, and father—a model citizen. Yet, the 51-year-old harbored a dark secret. During a business trip, he disappeared without a trace. It was only after a woman’s call revealed that the missing person had been using four additional phones for a double life in the swingers' scene, where he met his demise.
The body of young prostitute Kelly Hodge was found naked in a roadside ditch. Her clothes, bag, and phone were missing. The hunt for the killers remained unsuccessful for weeks—until the police reactivated the victim's phone.
When the police find Stephen Dempsey's abandoned car in a parking lot, there is no sign of him. His mutilated body is discovered shortly afterward. Then, another murder occurs at the same location. An intercepted call and a routine report of a stabbing lead the police to track down a psychopathic killer.
The successful psychiatrist Margaret Tobin is shot as she leaves her office—four bullets to the back. With no witnesses, the investigators are initially at a loss. However, two phone calls eventually lead the police to a highly educated but mentally disturbed murderer who had created a death list.
After the murder of 17-year-old Gabe Meyer, investigators focus on the ex-boyfriend of the victim's sister. The avid bodybuilder nearly escaped justice until a phone call recorded by the police exposed him as the killer.
Millionaire Peter Shellard, known for his eccentricity and fondness for BDSM, initially had his girlfriend as the prime suspect. However, phone taps and undercover investigations eventually led the police to a group of three involved murderers.