A police detective returns to her hometown and becomes involved in a missing person case, which is linked to her traumatic past and the town's dark history.
Two estranged cousins who never knew each other try to make amends for many generations of family dispute.
Sisters September and July share an intense bond, speaking in a secret language and keeping the outside world at a distance. After September is suspended from school, their mother brings them to a remote house on the Irish coast—where July begins to resist her sister’s increasingly sadistic control.
