Deep in the Florida Everglades, something is alive that should have died eons ago. Something is feeding when it should be full. Something is moving, in ways that seem all but impossible to pursuers. It's moving in the dark...under the surface of the waters…with an appetite that makes no distinction between man and beast. Now it's up to an unlikely band of locals, an animal control officer, a small-town sheriff and a scientist’s team of college youth to stop the threat...before it's too late.