Benjamin Brewster finally accepts that he is burned out as a Boston attorney, and when he discovers that his live-in love interest has been sleeping with one of the firm's partners, he becomes desperate to recover from his disintegrating life. As advised by his therapist, he gets away from Boston and rents a beach house on Block Island for three months. His vacation is picture-perfect until Hurricane Edwina moves up the coast and Ben is forced to hunker down overnight in a cellar as the category 4 hurricane hits.
At first light, he eagerly searches for treasures that the storm blew onto his beachfront. He spies tangled ropes heaped over what looks like a rubber raft and scrambles to his new possession, which turns out to be a prized Zodiac. When he pulls away the debris, he finds a woman sprawled in the bottom. The woman, Mel Yarrow, begs Ben to hide her. Men are looking to murder her because of a secret plot she inadvertently discovered while reading through some papers at work. He finally agrees to let her stay at the beach house. That decision drives him into her deadly world and he becomes a target for murder. Mel is drawn into the mysterious, paranormal world of Block Island. She meets an old woman in a cemetery who has powerful visions of these killers and warns Mel. To survive, Ben and Mel know that they need to stop the execution of the plot before the killers find them.