Several young couples travel to a mysterious private retreat that promises to strengthen their relationships. But what seems like an innocent getaway descends into a nightmare when they encounter an ancient demon known as Succubus living on the island. The creature soon begins luring victims into its web, assuming their form and provoking them into revealing their darkest desires and committing terrible acts.
However, one woman in the group has a secret history with this monster, and her fight against the Succubus becomes not only a battle for survival, but also a test of her moral compass.