The film follows the story of four teen girls diving in a ruined underwater city, who quickly find themselves in a watery hell as their fun outing turns into heart-stopping fear when they learn they are not alone in the submerged caves. As they swim deeper into the claustrophobic labyrinth of caves they enter the territory of the deadliest shark species in the ocean.

It’s l968 in America. Change is blowing in the wind...but seemingly far removed from the unrest in the cities is the small town of Mill Valley where for generations, the shadow of the Bellows family has loomed large. It is in their mansion on the edge of town that Sarah, a young girl with horrible secrets, turned her tortured life into a series of scary stories, written in a book that has transcended time—stories that have a way of becoming all too real for a group of teenagers who discover Sarah’s terrifying tome.