The Third Day

After Sam rescues a troubled young girl in the woods, he brings her home to the ominous Osea Island, where inhabitants are preparing for a curious annual festival; As he meets secretive locals, Sam finds the island difficult to escape.

Plagued by a disturbing dream, Sam awakes to find himself in a compromising situation and, having missed the morning crossing to return to the mainland, spends the day trying to learn more about the islanders. After a series of terrifying events leaves him shaken, Sam plots a way off Osea, but is convinced to stay put as the islanders prepare for a dry run of their big event.

Sam learns the truth about his connection to Osea; Sam is in the fight of his life as he tries desperately to escape the islanders' clutches and make it back to the mainland in one piece.

Helen brings her two daughters to Osea, but their trip takes an ominous turn while the family looks for a place to stay.

As the islanders prepare for a fateful birth, Helen reveals her true intentions in coming to Osea and, after joining a search party, is pressed on her past. A peculiar girl befriends Ellie and offers to take her to a mysterious place closed off to outsiders.

Series finale. With a fractious battle for power brewing, Helen and her family find themselves trapped in the middle.