After the death of her mother, 16-year-old Kay is on a mission to self-destruct. Unhappy at home and school, she only finds peace with the semi-wild ponies on the moors. She meets Sion up there, also looking to escape. They are drawn into a secret, intense love, but they cannot hide from their lives for long. But when Sion's terrifying, abusive father finally finds them, will Kay lose everything again?