Beneath the warm waters of the Gulf of Mexico, the biggest predator on the planet hunts, craving the flesh and blood of every creature it can sink its teeth into. Detective Jill McCourty receives a phone call from her old college professor when a mangled body washes up on the shores of Sharkwater Beach. Together they must discover what stalks the waters around the private island and stop it before it reaches the mainland. But how do you stop something so enormous, something so unique that it may have existed in another time? Jill vows to make sure what happens at Sharkwater Beach, stays at Sharkwater Beach.