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| Original Title | 水中の宮殿 |
|---|---|
| Author | 野村 胡堂 |
| Genre | Detective & Mystery |
| Author Type | Male Author |
| Summary | Fourteen-year-old Ayako’s life shatters when her father, a disgraced historian accused of fraud, dies under suspicion. Left with only her loyal elderly servant Shōhei, she flees Tokyo after a chilling warning: someone wants her dead. In Kamakura, sheltered by the vibrant Midorikawa siblings—athletic Ken’ichi and sharp-witted Yōko—Ayako begins to heal. But safety crumbles when Shōhei is brutally murdered, and vital records tied to her father’s doomed excavation of an ancient underwater palace vanish. Determined to clear his name, Ayako uncovers layers of deception: a stolen copper map, shadowy figures stalking her, and whispers of treasure buried beneath a river’s wrath. With Ken’ichi’s courage and Yōko’s cunning, she plunges into a labyrinth of danger—flooded tunnels, suspicious allies, and a legacy of betrayal. As past and present collide, Ayako must confront deadly forces guarding secrets that could redeem her father… or drown her in the depths of Hiraizumi’s cursed history. |