In autumn 1894, Sherlock Holmes is summoned from Baker Street to a rain-soaked county town where a chapel coronet is stolen, an innocent youth is arrested on a description that fits his borrowed clothes, and the case explodes into violence when a prison warder is shot dead during a staged “escape” and a bill-poster is murdered before he can speak; as Holmes and Dr. Watson follow altered records, a missing claim ticket, and a cryptic phrase—“The Seventh Day—Programme Changed”—the truth proves to be hidden in plain sight behind layers of pasted bills, where one dying man left the only proof that could break an arrangement built on convenience, corruption, and timing.