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

Written by Kit de Waal, Dean O’Loughlin and Dennis Kelly; directed by Philippa Lowthorpe.