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.

Desperate to save her sister, Abby takes a dangerous job in the remote Georgian wilderness. Stranded in the mountains after her helicopter crashes, she finds hope through John, a mysterious helper radioing from nearby. As he guides her through the harsh conditions, Abby struggles to survive, and her grip on reality falters until she is faced with an impossible choice.

When the ongoing rivalry between farmers Michael and Jack suddenly escalates, it triggers a chain of events that take increasingly violent and devastating turns, leaving both families permanently altered.