Dirk Bogarde in "Libel"

Libel is a 1959 British drama film. While travelling in London, Jeffrey Buckingham (Massie), a Canadian WWII veteran, sees Sir Mark Sebastian Loddon (Bogarde) on the BBC, leading a tour of his grand family home. Buckingham was held in a German POW camp with Loddon, and while watching him, becomes convinced that he is in fact another former POW, Frank Welney (Bogarde), an actor. Buckingham publicly announces his suspicion that Welney murdered Loddon during an escape from the POW camp, and has taken the young nobleman's place. Loddon sues Buckingham for libel, but his mind is still battered by some terrible incident that occurred during his escape fifteen years before, and in time even his loyal wife (deHavilland) begins to doubt him. Starring; Dirk Bogarde Olivia de Havilland Paul Massie