Based on Daphne du Maurier's novel, "The Scapegoat" is a remake of a 1959 movie starring Sir Alec Guinness in a dual role as two men who seem to be twins separated at birth. We never find out why they look so alike, but we do get to enjoy a "Prince and the Pauper" type story when one of the men decides to switch places with the other, and a good yarn ensues.
Mark Rhys does such an excellent job at being two men that I was not exactly sure until the credits that he was playing a dual role.
As a bonus, the man who starts out as the "pauper" and who becomes the "prince" is, by profession, a schoolteacher of ancient Greek, and there is a lovely little classical reference to Phineas and the Harpies tucked into the movie.
As another bonus, the actress Alice Orr-Ewing, who is enormously appealing as the wife of the switcheroo guy. In the promo photo she is the one sitting, not looking that appealing at the moment. That's part of the appeal.
As a third bonus, scroll down from the above movie link and read the review on imdb.com by paranormal Egyptologist Robert Temple. The most literate movie review I've ever read, by far.
Woo-hoo for good yarns.
Image found here.