Randall a Hopkirk - S01E26 - The Smile Behind the Veil 1970

Jeff Randall and Marty Hopkirk are private detectives who specialize in divorce cases. Their long-running partnership seems to come to an abrupt end when Marty is killed by a hit-and-run, but Marty is soon back--as a ghost--to help solve his own murder. While he's doing it, he misses his chance to go to heaven, thanks to an ancient curse that states: "Before the sun shall rise, each ghost unto his grave must go. Cursed be the ghost who dares to stay and face the awful light of day." So Marty is stuck on Earth, as a white-suited spirit whom only Jeff can see, continuing their partnership and keeping (jealous) tabs on his wife/widow, Jean. Synopsis: Marty sees a funeral near his grave. Based on what he overhears he's certain that his ""new neighbor"" suffered the same fate he did: a murder made to look like an accident. Jeff has an appointment with a prospective client and is unwilling to do something for Marty for free, so Marty must trick him into looking into the death.