"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 is also known as The Case of Mr Pelham. The book was reprinted in 2021 by B7 Media, available on Amazon. Source: Wikipedia (en)