Maki, a porter at the Sakura Hotel, finds a body in Room No. 2 and picks up a piece of paper on which is written "one-third of the key", also the part of a key. From a newspaper he learns that the dead man is an official who has been detained as a suspect in a bribery case involving 150,000,000 yen and that another suspect named Matsunaga is still in custody. Maki realizes that if he can obtain the other two-thirds of the key, he will be a multi-millionaire.
Ryōji Hayama
Mihoko Inagaki
Yōko Minamida
Hiroshi Nihon'yanagi
Hiroshi Kondō
Kaku Takashina
Akira Ōizumi
Hiroshi Hijikata
Fumio Ōmachi
Tatsuo Matsushita
Zenji Yamada
Nobuo Kawakami
Zenpei Saga
Mieko Hirooka
Fudeko Tanaka
Hiroshi Kōno
Shirō Yanase
Kenzô Kawabe
Shusui Tsuda
Yukihiko Sugi