Nate Thalmann wants to escape his life as a Prohibition Era bootlegger. He moves with his pregnant wife Alice to the Farallon Island lighthouse, situated on a rocky islet twenty-seven miles off the California coast. Joining three other keepers and their families, he hopes for peace and a deep reconnection with his wife. But one of the keeper's children finds a secret cave, and releases a malicious entity imprisoned within. It possesses a former keeper...