The librarian has the book all ready, and it’s about a pleasure cruise that turned to horror. A cruise ship is destined for Hawaii, with three couples aboard. Kay is the jealous girlfriend of Peter, who just saw an old flame of his, and she’s upset over the thought of Peter’s straying.
Elsewhere The other couples laugh over the practical joke of having Sally, the old flame, appear, but nobody invited her. Can she be locked in a cabin out of the way? Suddenly the body of Sally is found in Carla’s room, but was she planted there to cast suspicion? Carla and Sally were friends, might there have been a rift?
The remaining friends get together to figure out who had alibis, and figure out who might be a killer. Kay accuses her fiancee Peter, but did he really do it? Bob and Carla search the cabins, looking for clues, and they seem to have something conclusive. An incriminating letter points to Chet, who is now drinking himself into oblivion. Did he have an affair with Sally? Phillus approaches Peter to accuse him as well, because she things he forged the letter to implicate her boyfriend, Chet. Peter thinks that Kay is setting him up.
The plot twists take a turn when kay is found dead. Bob thinks he has the answer and calls all the friends together to expose the killer and untangle the mystery. Listen in to find who wrote that letter, their motives for the crimes, and why they orchestrated the whole thing the way they did.