For ten years, John (BAFTA-winner Jared Harris) and Mary (BAFTA-nominee Juliet Stevenson) have lived in anguish after their daughter Clare vanished without a trace. Now, at twenty-four, Clare (Erin Doherty) suddenly returns, but while Mary is overjoyed, John grows suspicious, believing she may not be who she claims.

Director Daniel Kokotajlo's follow up to his BAFTA nominated debut Apostasy sees Matt Smith and Morfydd Clark star in this highly anticipated adaptation of Andrew Michael Hurley's popular folk horror novel. In 1970s rural Yorkshire, Richard and Juliette Willoughby’s seemingly idyllic family life is thrown into turmoil when their young son Owen starts acting out of character.