After an ambitious solo trip leaves her shipwrecked on a remote island, a young sailor is rescued by its lone inhabitant: a lighthouse keeper. As the walls of reality begin to vanish and the trust between them unravels, survival becomes a test of grueling proportions.

Joe and Christina's marriage is in trouble when they take a sailing trip with their married best friends. On the trip, Christina vanishes and is presumed dead. Joe is suspected of her murder, but he believes Christina isn't dead at all when strange things begin to happen. Joe isn't sure whom he can trust as he discovers disturbing information about his missing wife.