In Northern Michigan, nature is about to reveal its deadliest secret.

A series of strange events baffle the residents of a local resort town. People go into the water and disappear; lakeshore properties are mysteriously vacant; and a bizarre slimy mass accumulates within the weeds.

When his customers begin to vanish without a trace, resort owner Greg Goodman unites with the local Sheriff to investigate the matter. Before long, they realize something is lurking in this lake—something that was not here before.

The threat quickly escalates beyond the reach of the shoreline, forcing drastic government response, and attracts the attention of the mysterious organization N.E.C.T.O.R. led by Doctor Mike Wilkow.