Joseph Losey's The Finger of Guilt (1956)

 Losey made The Finger of Guilt (British title: The Intimate Stranger), along with screenwriter Howard Koch, in England after they were both blacklisted in America.  Losey's film is something of an allegory about his own experiences, though like the best allegories it works effectively in a strictly narrative sense.  Reggie Wilson (Richard Basehart) leaves America to make a film in England after a scandal involving a studio head's wife.  Shortly after Wilson starts a new film under producer Ben Case (Roger Livesey, who appeared in films by Michael Powell and Emeric Pressburger) he marries Case's daughter Lesley (Faith Brook).  Wilson starts getting harassing letters from Evelyn Stewart (Mary Murphy); she claims they were lovers and that he convinced her to come to England;  Reggie and Lesley track her down in Newcastle.  Reggie can't remember her at all -- he thinks he is going crazy -- while Lesley is convinced enough to leave Reggie as Ben Case cancels his film, ostensibly for budgetary reason.

A relatively low-budget movie, The Finger of Guilt is shot on location in London and Newcastle in black-and-white by cinematographer Gerald Gibbs and written by Koch (one of the writers for Casablanca in 1942) and reflects their own confusion about having to leave America to work in England, as well as Losey's continued discontents about society reflected in such films as The Prowler (1951) and The Boy with the Green Hair (1948) in America and his later films written by Harold Pinter.