An anonymous note accusing a student of witchcraft triggers a wave of paranoia and suspicion within a classroom where magic is a capital offense. The protagonist, a young student who discovers their own burgeoning magical abilities, must navigate the mounting hysteria of their peers and the looming threat of state-sanctioned execution. As the social order of the school begins to collapse under the weight of accusations, the students are forced to confront the reality of their hidden identities. The narrative employs a third-person perspective to track the shifting alliances and fears of the class, eventually drawing the attention of the powerful enchanter Chrestomanci to resolve the escalating crisis.

This work is widely regarded as a clever subversion of the boarding school genre, blending humor with a darker, more serious critique of societal intolerance. Readers often highlight the author's ability to balance the whimsical nature of magic with the genuine peril faced by the characters. The inclusion of the Chrestomanci character provides a grounding force that connects the narrative to a broader, well-established magical universe. The pacing is frequently noted for its rapid escalation, keeping the tension high as the mystery of the anonymous note unfolds. It remains a staple of the author's bibliography, praised for its sharp dialogue and imaginative world-building.