 Just before taking an irrevocable and tragic step, Caroline talks to Claire, her lycée friend. Later, Claire gathers five other school friends, and tells them Caroline s secret. The six agree to wage a guerrilla war against their philosophy teacher, the sarcastic and belittling M. Terrien, the cause of Caroline s despair. After seeking advice from Mayard, the school s guidance counselor and a leftist with a police record, the six look for evidence that could get Terrien fired. They strike gold, and then raise the stakes. Sarah, one of the six, hatches a deadly plan.