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Pamela Crane (Belinda Montgomery), the recenty widowed niece of Jessica Fletcher (Angela Lansbury), goes on a relaxing ocean cruise in hopes of overcoming her husband's sudden death. This, however, proves impossible, as Pamela is systematically terrorized by the appearance of several personal artifacts which only her late husband could have known about. Can it be that Pamela's husband is still alive? That's the question Jessica hopes to answer as she unofficially takes over investigation of the case. (Incidentally, the full character name of Jessica's niece is Pamela MacGill Crane--and by a curious coincidence, the mother of star Angela Lansbury was character actress Moyna MacGill).