Sarah lives in Axe Falls—a town of mysterious disappearances, terrifying visions and unusual events. Sarah is sure that Axe Falls is haunted. But no-one believes her stories about the mysterious lights and noises beneath her houseboat. Searching for proof, she dives into the ocean, only to discover something much more dangerous than a ghost. Sarah begins to wonder ... What else is skulking in the deep, dark water? And will anyone survive long enough to find out?