Duffy is a 1968 Anglo-American comedy film directed by Robert Parrish and starring James Coburn, James Mason, Susannah York and James Fox. Originally called "Avec-Avec", French for "with-it", according to 1967 press reports, Columbia Pictures changed the title of the movie, despite the protests of the stars.
Duffy is a cunning aristocrat of criminals who is hired by Stefane, a young playboy, to hijack a boat carrying several million dollars of his father's fortune. The plot succeeds, with a little help from Segolene, Stefane's girlfriend - but also with an unexpected, sudden turn of events.