At an international boarding school, an unassuming, yet rigorous, Miss Novak (Mia Wasikowska) joins the teaching staff to instruct a new class on "conscious eating." Her impressionable teenage students each have their own reasons for joining the class -- to improve fitness, reduce their carbon footprint, or get extra credit. Although early lectures focus on mindful consumption, Miss Novak’s discussions soon become increasingly disordered and extreme. A suspicious headmistress, concerned parents and the failing health of her students lead everyone to question the inscrutable Miss Novak's motivations for teaching the class. As a few devoted pupils fall deeper under her cult-like tutelage, they are given a new, even more sinister goal to aspire to -- joining the ominous "Club Zero."