Blueprint of Murder (1961)

Yuzo Kayama plays the protagonist, a whale-hunting cannon manufactuing supervisor, whose brother is an automobile tester for Komatsu Motors which has a fatal accident. As his brother investigates the "Accident" with his old college friend (makoto Sato), now a reporter... They stumble across murder, espionage and cover-ups. High-class night club, femme fatale, and a "Blueprint of Murder" all adds up to a bigger plot then first expected.