The novel “The Two-Timers” by Bob Shaw was published for the first time in 1968. Jack Breton spent years with the guilt of having left his wife alone and for that reason she was attacked and killed. Over time, he had strange visions and studying the subject he discovers a way to not only see but also intervene in the past. Jack manages to save his wife but he creates a new timeline and must face his alter-ego to win her back.