When Lord Murashige rises up against the tyrannical Oda, he finds himself besieged within the walls of his own castle. Isolated, he is confronted with a series of mysterious crimes that shatter the fragile order of his court, plunging the fortress into fear and suspicion.

With Oda’s army closing in and a traitor hiding among his ranks, Murashige is forced into an uneasy alliance with Kanbei Kuroda, a brilliant yet dangerous strategist held prisoner in the dungeon. Helped by his wife Chiyoho and his most loyal generals, Murashige must uncover the truth before the castle falls.