A man in a theatre audience is found dead during a performance, and his inexplicable death triggers a tightly plotted investigation. An experienced police inspector and his son, a mystery-writer gifted in deduction, pursue methodical inquiry into seating, costume and hat evidence, and forensic detail. The narrative unfolds through interviews, legal conversations, and social encounters that expose motives among theatre personnel and patrons. Clues are assembled and weighed in a formal analytical climax that explains the mechanics of the crime and identifies the perpetrator.