The Third Day

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, where inhabitants are preparing for a curious annual festival involving the island's history. As he meets Osea's secretive locals, Sam grows increasingly desperate to return to the mainland to make an important call – but the island proves 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' beliefs. After a series of confusing and terrifying events leaves him shaken, Sam quickly plots a way off Osea with Jess, but is convinced to stay put as the islanders prepare for a dry run of their big event.

Sam is shocked to learn the truth about his connection to Osea and the islanders' intentions for his future. Later, in a fight for his life, Sam tries desperately to escape their clutches and make it back to the mainland in one piece.

HBO audiences will be able to watch this 12-hour event unfold on HBO's Facebook page with streaming beginning at 1:30am PT/4:30am ET. After the initial broadcast, viewers will be able to replay the event in its entirety on HBO's Facebook page. For viewers who seek more of The Third Day , Autumn will allow them to be immersed in the world of the show on the island of Osea. A unique live event broadcast online, "Autumn" serves as a bridge between the three episodes of "Summer" and the three episodes of "Winter" while not being requisite for enjoying the limited series. Featuring members of The Third Day cast including Jude Law and Katherine Waterston, viewers will follow the events of a single day in real time. Florence Welch will also feature in an acting role. Capturing events live and in one continuous take, this cinematic broadcast will invite viewers deeper into the mysterious and suspenseful world of THE THIRD DAY, and blur and distort the lines between what's real and what's not. It is created by theatrical innovators Punchdrunk and co-directed by founder and artistic director of Punchdrunk, Felix Barrett, and "Summer" director Marc Munden, with Sky and Punchdrunk producing.

Helen surprises her two daughters, Tallulah and Ellie, with a trip to Osea Island for Ellie's birthday. After finding that the cottage she booked is suspiciously no longer available, Helen scours the island for a place to stay, but finds resistance at every turn.

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.

With a battle for power brewing, Helen comes face to face with what she's been searching for since arriving on the island. When the sisters are separated, Tallulah witnesses a gruesome act of violence, and Ellie learns of their mother's hidden agenda. As tensions reach a fever pitch for all those on Osea Island, Helen and her girls make a desperate final attempt to escape.