The detectives investigate a rash of bomb threats against businesses. Then a night watchman is found murdered. The watchman was part of a gang that is planning a bank robbery. The mastermind of the gang, Sordo, has made the threats against other businesses in order to distract the police from his real plan, and killed the watchman because he was seeing a woman and fears he might have leaked the plan to her. When Kling finds the woman at the house of the murdered man, Sordo arrives and shoots Kling and takes the woman hostage.
—anonymous