Sigrid Sugden is a Shrike, a member of one of the toughest group of girls in school. They are experts at blackmail, extortion and bullying their terrorized classmates. But one day, the Shrikes go too far. Sigrid realizes that their favourite victim, Prinny Murphy, is in real danger. She makes a decision that will save Prinny from danger but will turn the Shrikes anger and bullying against the former friend who betrayed them to the authorities.