Det.-Insp. is pulled off an investigation into a pair of racketeering brothers. By the time he returns to the case, Det.-Sgt. Hadley has been murdered.
Det.-Insp. Maguire investigates a case of attempted murder. He wants to arm his team, but is frustrated by the long-established rules agains the use of firearms.
Royal Canadian Mounted Policeman Mike Maguire, newly arrived in England to study British crime detection methods, comes across the victim of a stabbing while on his way to Scotland Yard. His first case is to break a protection racket business.