AllMovie

Barbara Rush guest stars as Magnum's beloved Aunt Phoebe, a Pulitzer Prize-winning playwright known for her extremely vivid imagination. When Phoebe insists that she is being stalked by a murderer, Magnum (Tom Selleck) wonders if the old dear is suffering from the early stages of Alzheimers'. As it turns out, she is--but that doesn't necessarily mean that her life isn't in danger. As an added complication, Magnum must do all of his investigating on the sly: thanks to a bureaucratic oversight, his detective's license has expired.