Something lurks off the coast of Block Island, silently influencing the behavior of fisherman, Tom Lynch. After suffering a series of violent outbursts, he unknowingly puts his family in grave danger.

In an attempt to avenge her daughter’s death, Irene Kelly travels through parallel universes, killing her daughter’s murderer again and again. As she becomes consumed by vengeance, her humanity begins to slip away—until the cycle is disrupted when she rescues Mia, a sharp-witted teenager already marked by the killer.