In a sleepy beach community shoppers at an underground supermarket are terrorized by a crazed bandit when the unimaginable occurs:

A monstrous freak tsunami swallows the town.

Now trapped, with rushing water threatening to entomb them in a watery grave, the survivors discover they are not alone.

The tsunami has brought unwanted visitors from the depths. Not only must they overcome the threat of drowning and the predator within their midst, but a threat far more deadly and far more bloodthirsty - packs of hungry tiger sharks.