This English comedy is based on a short play by Peter Shaffer (better known for Equus). Belinda is a free-spirited American woman married to a stuffy English rolled-umbrella man. When he leaves for work each day, she leaves their London apartment too. She says she's just sightseeing, but he doesn't believe her. He hires a private eye (Chaim Topol) to follow her around and find the "other man" in her life. What she said was true, however, and the private eye becomes her traveling companion. He tells his employer that she was telling the truth, but he doesn't believe him. At that point, the detective admits to being the "other man," complicating things thoroughly.