When Nadine, an aspiring marine biologist, wins a trip to a resort island, she can't believe her luck. Especially when the island turns out to be better than her wildest dreams-with theme parks, fancy accommodations, and all the food she can eat. But then people start disappearing, and it becomes crystal clear that there are some very hungry creatures lurking beneath the lagoon's murky surface-waiting to make Nadine and her brother the main course!