In a windswept fishing village, a mother is torn between protecting her beloved son and her own sense of right and wrong. A lie she tells for him rips apart their family and close-knit community in this tense, sweepingly emotional...

Set in 1981, this film tells the story of a young girl, Cáit, who is sent away for the summer from her dysfunctional family to live with "her mother's people". These are Seán and Eibhlín Cinnsealach; a middle-aged couple she has never met. Slowly, in the care of this couple, Cáit blossoms and discovers a new way of living, but in this house where affection grows and there are meant to be no secrets, she discovers one.

Keira Woods' daughter mysteriously vanishes in the cellar of their new house. She soon discovers there is an ancient and powerful entity controlling their home that she will have to face or risk losing her family's souls forever.