The play opens with the discovery that a pupil named Martineau has hanged himself after being caught by a teacher having sex with another boy. The first act follows the reaction of some of the students to his death as the senior boys try to keep the scandal away from both the parents and the outside world. Barclay, the Head of Gascoigne's House, moves towards a nervous breakdown, blaming himself for the boy's despair. Bennett, the only openly gay member of the school, pretends nonchalance but is deeply troubled by the suicide. His best friend Judd, the school's only Marxist, believes the death is a symptom of the school's oppressive regime. When the parents of the aristocratic Devenish threaten to remove him from the school in light of the scandal, Fowler (a prefect) attempts to crack down on the perceived perversion in his House, and to persecute Bennett in particular. The other students initially defend Bennett's provocative and incendiary behaviour (partly due to Bennett's ability to blackmail them with knowledge of their own same-sex trysts). Meanwhile, Judd is reluctant to become a member of the school's exclusive 'Twenty-Two' society (a name which references Eton's 'Pop') himself. This is because he feels that this would endorse the school's system of oppression. However, he agrees to do so – after much pressure from his peers Menzies and Bennett – in the hope of preventing the hated Fowler from becoming Head of House in the wake of the Martineau scandal. But in the end, Judd's moral sacrifice is for nothing. In the second act, Fowler intercepts a letter from Bennett to his lover Harcourt, and Bennett's supporters fade away. Bennett is beaten, Judd is humiliated, and it is Devenish who is ultimately invited to join 'Twenty-Two' in the place of Bennett, shattering Bennett's childhood dream.