London is held in the grip of a serial killer whose modus operandi is to murder his victims by strangling them with a necktie. When short-tempered ex-Royal Air Force officer Richard Blaney discovers his ex-wife murdered, Blaney becomes a suspect. Forced to go on the run, Blaney attempts to take refuge with his best friend, fruit merchant Bob Rusk, however Rusk may, in fact, be the necktie murderer himself.
