In the film"Mystery of the Caribbean Sea", Major Palgrave, a quirky yet delightful author of detective stories, informs Miss Marple at a lavish resort in the Caribbean that one of the visitors is a killer who targets wives like Bluebeard. Tragically, the Major passes away from what seems to be an accidental mix of alcohol and medication for high blood pressure before he can disclose the culprit. As it is revealed that the medication belonged to a different guest and the crucial photo in the Major's possession has vanished, Miss Marple understands that the murderer has struck once more and that more deaths are on the horizon.