Every year during spring break, the population of sleepy Lake Victoria grows from 5,000 to 50,000. In the sun's warmth, a raucous party breaks out with plenty of alcohol. But this year there's another reason to worry, and it's not just the heavy after-party blows or complaints from neighbours. There's a new kind of fear and threat at the lake. After a sudden underwater earthquake, prehistoric man-eating fish begin to threaten the local population. Groups of visitors, who don't know each other at all, must band together and work together to stop the resort's new sharp-toothed inhabitants from making food out of people.