 After Joe Curran turns his back on the rackets, syndicate hit man Pete Curran reluctantly obeys the order to kill his own brother. Pete stabs Joe to death, but leaves his knife behind. "Supervisor" George Foley knows the implications of Pete s mistake, so he kills Pete with Pete s own gun so it will appear to be a suicide. Dan Mathews knows that professional killers seldom experience remorse and almost never commit suicide, so he deduces that a "supervisor" must have been involved. Dan enlists the aid of Joe s widow Mary to identify Foley. Mary agrees, but she intends to kill Foley herself and slips a gun into her purse. Dan has only a short time to identify and capture Foley AND prevent a third murder.