Ten-year-old Bethan, an only child, moves with her family to a remote house at the foot of the mountains. She is soon mesmerised by a dysfunctional family farming nearby. The wild daughter, Nia, becomes her friend, unreliable though she may be. The son, Morgan, both scares and fascinates her, and as she grows up, she ends up getting dragged into his devious plots. When circumstances conspire to means she is left alone to run her family farm, his knowledge of sheep and willingness to help her prove invaluable, but after seducing her he starts to take over her life. His spying and stalking make her a physical and emotional wreck – is there no option but to move from Cwmgwrach, her beloved farm, or is there some other way to get rid of his menace?