Kate Jarvis delivers a compelling performance as the unpleasant yet sympathetic character of “Mia.” She resides with her mother and sister, displaying a rebellious and indifferent nature. This sentiment is mutually felt, until her mother introduces “Connor” (Michael Fassbender), a new romantic interest. Connor quickly dismisses Mia’s dramatic outbursts, which only serves to further irritate her. Simultaneously, she's focused on liberating a horse held by local youths and secured near their caravans. Her attempt, involving a hammer, doesn't unfold as anticipated, though it does lead to an encounter with “Billy” (Harry Treadaway), potentially redeeming the situation somewhat. The narrative makes Mia’s intentions obvious, and the briskly moving story highlights her cleverness in pursuing them. However, this is where the plot noticeably declines for me. An excessive amount of backstory is presented, and Mia's subsequent actions become so irresponsible and inconsiderate that any empathy I initially felt vanished. There’s a distinct lack of connection between Jarvis and Fassbender (or Treadaway), which undermines the sense of authenticity. While the film possesses an appropriately gritty atmosphere, it leaves me questioning how she transformed into this troublesome adolescent and why anyone—family or otherwise—should invest in her fate. Despite this, Kate Jarvis's performance is notably powerful and believable.

Source on TMDB