Investigative reporter Mark Williams and his marine biologist wife Flo are trying to decide where to go on vacation when they get a frantic phone call from one of Flo's old professors who now lives in the Bahamas. He begs Flo and Mark to join him in Bimini, promising new scientific discoveries for Flo and a breaking-story scoop for Mark. Intrigued, the couple fly to meet Professor Delta in Bimini. But what they find when they get there is a lot more than they had bargained for—in fact, it could cost them their lives...