"The Strange Case of Mr. Pelham" is a 1940 short story (later expanded in book form in 1957) by English writer Anthony Armstrong about a man involved in a serious car accident. The man recovers only to find himself being stalked by a seemingly identical version of himself. It was made into an episode of Alfred Hitchcock Presents which originally aired December 4, 1955, under the title "The Case of Mr. Pelham", and starring Tom Ewell as the victim of his own Doppelgänger. The book was reprinted in 2021 by B7 Media, available on Amazon. Source: Wikipedia (en)