Brannigan (1975)

Jim Brannigan is sent to London to bring back an American mobster who is being held for extradition, but when he arrives, he has been kidnapped, which was set up by his lawyer. Brannigan, in his American Irish way, brings American law to the people of Scotland Yard in order to recapture this mobster with a price tag on his head and a stuffy old London cop with whom to contend.