Sherry (Ellen Page, Juno) is a 15-year-old punk kid in London who joins up with a nomadic cult called S.P.A.R.K. (Street People Armed With Radical Knowledge). Sherry adopts the group as her surrogate family, and travels with them across Europe until they eventually squat an old vineyard in Portugal. She loses her virginity and her illusions as she becomes drawn deeper into the group and discovers too late that S.P.A.R.K. isn't exactly what it appears to be. Soon Sherry's mother Rose (Natasha Wightman, V for Vendetta) tracks her down and attempts to rescue her but gets lured in by Harry, the extremely charismatic leader who convinces her that S.P.A.R.K, has more to offer than life as single mother living in London. Tensions come to a boil as Harry manipulates the S.P.A.R.K. kids with psychological game playing and brutal punishment. Two deaths ensure the submission of most of the group, but Sherry and her potential lover Mad Ax plan a daring escape. This intense psychological drama explores power dynamics and the deficiencies of human nature in an articulate and smart way, and serves as a warning against hierarchy and cult-of-personality.