When FBI Agent Zack Stewart is killed, Agent John Ripley takes over the three cases he was working on, hoping one will lead to his killer. The first involves gangster Joe Walpo and Ripley finds his hideout through Joe's girl friend, Connie Anderson. Joe is killed but it is established he was 400 miles away when Stewart was murdered. The next involves a car-theft gang which Ripley breaks up by using one of the gang, Vince Angelino and his wife Julie. The last case involves Kate Martell, the victim of an extortionist who threatens to kidnap her child unless she pays him $10,000这时候围墙上的探照灯已经移过来，众人探头随着光柱看下去，这一看朱由勃然大怒，方雅竟然幸运的掉在一堆霉烂的麻袋上，那里原本是条沟，因为长久倾倒垃圾形成一个小土包，不久前一批霉烂的麻袋被清理出粮库，方雅落在上面竟然毫发无伤，而且用力一挣竟然把绳子解开了。