When FBI agent Zach Stewart was killed, Agent John Ripley took over three cases he was working on, hoping to find the murderer in one of them. The first involves gangsters Joe Walpo and Ripley finding Joe's hiding place through his girlfriend Connie Anderson. Joe was killed, but it was confirmed that Stewart was 400 miles away when he was murdered. Next, a car theft gang is involved, and Ripley uses one of the gangs, Vince Angelino, and his wife, Julie, to disrupt it. The last case involved Kate Martell, the victim of a blackmailer who threatened to kidnap her child unless she paid him $10000