A murder at sea, a killer below deck? BELOW DECK meets KNIVES OUT in this breathless voyage into murder and mayhem on the high seas... Howie Temple is down on his luck and desperate for cash. Once an action movie star, he now lives off a crumbling reputation. On his way to film a new reality TV show, which casts a team of c-list celebrities as crew aboard a luxury yacht, he meets fellow contestant, influencer-of-the-moment Cassandra Troy. The duo take an immediate dislike to each other. After a hectic first day of filming, the pair are shocked discover that the captain of the ship has been murdered – locked in his control room, slumped over the wheel, a knife in his back. Convinced by the show's ever-opportunistic director to keep the cameras rolling, the pair team-up to hunt the murderer. Will the show make Howie and Cassandra bigger stars than they could ever dream of? And can they crack the case before the killer strikes again, or will they go down with this sinking ship?