Akira Naruse / Gorô Katayama - Private Detective
Taisuke Kurosu, a jeweler
Ayako, Kurosu's second wife
Kiboku Rin - a mysterious manager
Jun'ichi Norita - a young man
Yoshizô - old servant of Akiko
Akiko Kitamura, a daughter of Kurosu's former wife
Shibayama - Kurosu's secretary
Sagara - Katayama's assistant
