Old West highwayman Bill Miner, known to Pinkertons as "The Gentleman Bandit," is released in 1901 after 33 years in prison, a genial and charming old man. He goes to Washington to live and work with his sister's family. But the world has changed much while he has been away, and he just can't adjust. So he goes to Canada and returns to the only thing familiar to him -- robbery (with stagecoaches changed to trains).
Franca and her husband Antonio decide to sell a yellow rug which was a gift of Franca's stepfather. One day, while Antonio is out, a strange man rings saying he wishes to buy the rug. But the man's visit becames a nightmare. He kidnaps Franca and says he killed his wife on that same yellow rug. Then Franca kills the man. But is that really all that has happened? And who was that strange man?
Aging Major Palgrave, an idiosyncratic but charming mystery writer, reveals to Miss Marple that one of the guests at a luxurious Caribbean resort they're staying at is a Bluebeard-type wife murderer. Unfortunately, the Major succumbs to an apparently accidental overdose of alcohol and blood pressure medication before revealing the killer's identity. When it's discovered that the medicine belonged to another guest and the revealing photograph the Major was carrying is missing, Miss Marple realizes that the serial killer has struck again and more murders will follow.