The luxurious Furugami family estate is beset by madness, murder and a terrifying curse. Within, a drunken sword-wielding old man struggles to keep control of his family. Meanwhile Yachiyo seems unable to prevent her dark past coming to light. Captivating, unstable and determined to fulfil a terrible prophecy, she is plagued by sleepwalking episodes by night, and cryptic letters during the day. When a mutilated, headless body is discovered on the estate, all the evidence points to Yachiyo. Enter famed detective Kosuke Kindaichi, who is called on to pick apart the threads of the family's carefully-woven story. But can he find the killer before the family is destroyed by its own secrets?