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

由南奈利．约翰逊导演的一部故事构想相当巧妙的间谍斗智片。　　描述一位派驻西柏林的美军下士，被俄国间谍劫持往东柏林作人质，目的是要跟美国交换一位德国将领。负责此事件的美军上校，以其人之道还治其人之身，将被俘下士救了回来。节奏紧凑，特别是片中的几个悬疑镜头让人回味无穷，娱乐性也颇为浓厚。