 They discover a lead from a museum curator that a mysterious Professor Renault (Bela Lugosi) lives on the Caribbean island of San Sebastian and has been creating zombies.Followed by Ace's henchmen, the boys are immediately placed on a tramp steamer sailing to San Sebastian in the Virgin Islands and ordered to bring a real zombie back or forfeit their lives.Upon arrival they meet the beautiful cabaret singer Jean La Dance (Anne Jeffreys).