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Story summary
- Murashige Araki imprisons envoy Kanbei Kuroda in the basement of Arioka Castle during the 1578 siege, refusing to behead him and breaking samurai code.
- Araki investigates four locked-room murders over the year-long siege, questioning suspects on tatami mats.
- Kuroda, chained in the basement, solves each murder by posing riddles that reveal the killer.
