Director Peter Jackson helms this chilling true-life drama about an obsessive friendship. When circumstances bring together two imaginative teenage schoolgirls (Kate Winslet Melanie Lynskey), and they quickly form an unwavering bond, creating a fantasy world that only they can share. But when their parents become disturbed by the intensity of the friendship and threaten to keep them apart, the girls vow to stay together and devise a secret plan that leads to shocking consequences.