"Kaya" (Isabel Gravitt) and her diving pals "Tessa" (Genneya Walton) and "Xander" (Koa Tom) find themselves stuck out at sea with two of them quite badly injured. Would you believe it, a boat is sailing nearby and the skipper spots them floating away with his binoculars and goes to the rescue. He's a curious sort of chap who doesn't seem remotely interested in his new charges, indeed he leaves the poor lad splayed on the deck! Next thing, both the girls are in the cargo hold and he (Alex Wraith) has arranged a rendezvous with a physician who has an altogether more sinister intention than they'd...