Kenneth Bianchi claims he has multiple personalities, and that "Steve" is the Hillside Strangler who kills with a partner. The Dating Game Killer is arrested but proving his guilt will not be easy. Detective Souza begins his pursuit of the Freeway Killer.

While Detective Souza chases the Freeway Killer, he consults with one of the Tool Box Killers. To avoid the death penalty, the Hillside Strangler agrees to testify against his murder partner, Angelo Buono. A new serial killer strikes on the Sunset Strip.

The Sunset Strip Killer leaves a decapitated head for the detectives. The Freeway Killer is sentenced to death and Detective Souza fulfills a promise. The Dating Game Killer is re-tried. The long trial of the Hillside Strangler ends with drama.