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Precisely thirty-years after first bringing star detective Kosuke Kindaichi to the screen in The Inugami Family, acclaimed Japanese director Kon Ichikawa returns to follow author Seishi Yokomizo's super sleuth on his most challenging case. World War II has recently drawn to a close, and as powerful pharmaceutical executive and notoriously ruthless family patriarch Sahei Inugami (Tatsuya Nakadai) lays dying in his Nasu deathbed, his heirs all gather around to hear the reading of the will. Unfortunately for his eager offspring Sahei expires before summoning the strength to name his heirs, and family lawyer Furadate (Atsuo Nakamura) states that the will cannot be read aloud until all family members are present and accounted for. As eldest daughter Matsuko (Sumiko Fuji) sends for her war-ravaged son in Fukuoka, the lawyer's assistant contacts detective Kindiachi (Koji Ishizaka) with concerns about foul play. No sooner does the assistant voice his suspicions than he drops dead due to poisoning, and the eagle-eyed gumshoe begins working around the clock to crack the case.