Harper's Island is about a group of family and friends who travel to a secluded island off the coast of Seattle for the wedding of Henry Dunn and Trish Wellington. Seven years ago on this island, John Wakefield murdered several people, including Abby's mother. As the wedding festivities begin, friendships are tested and secrets exposed as a murderer claims victims, one by one, transforming the wedding week of fun and celebration into a terrifying struggle for survival.
In every episode, someone is killed and every person is a suspect, from the wedding party to the island locals. By the end of the 13 episodes the killer is revealed... who will survive?