After Sam, a London family man in crisis, rescues a troubled young girl in the woods, he brings her home to the ominous Osea Island.

Plagued by a disturbing dream, Sam awakes to find himself in a compromising situation.

Sam is shocked to learn the truth about his connection to Osea and the islanders' intentions for his future, leading to a fight for his life

Winter. Helen surprises her daughters with a trip to Osea Island, but the cottage she booked is suspiciously no longer available

As the islanders prepare for a fateful birth, Helen reveals her true intentions in coming to Osea.

As tensions reach a fever pitch for all those on Osea Island, Helen and her girls make a desperate final attempt to escape.