Puzzle (movie, 1974)

In London, an amnesiac is abducted and beaten by a stranger who calls him a "dirty son of a double-crosser." When a sniper's bullet kills his attacker the man flees the country with airline tickets provided by a wife he never knew he had. Arriving home, his wife calls him a "dirty rotten bastard" and he is threatened by another stranger who demands that he return a million dollars in uncut heroin - or die....