Libel

A California commercial pilot sees a telecast in London of an interviews with Sir Mark Lodden at his home. The Canadian is convinced that the baronet is a fraud, that he is actually a look-alike actor named Frank Welney. The Canadian, the baronet, and the actor were all prisoners in the same German camp during the war and escaped together. One of them disappeared during the escape. Was he Sir Mark or Welney? (imdb)