Robbie Bridgeman and his two friends, Tara and Landon Phillips, are in trouble. When they set out for a day of fishing in Sardis Lake, Mississippi, they're hoping to catch big fish. They'll find one, all right...but this fish is far bigger than they could have ever imagined. The fish that has been lurking in the lake isn't a bass or bluegill or pike. It's a megalodon...a giant, prehistoric shark that is over sixty feet long. And Robbie, Tara and Landon are i a tine rowboat.