Masao Masuto (1978–1984)
- The Case of the Russian Diplomat (1978)
- The Case of the Poisoned Eclairs (1980)
- The Case of the One-Penny Orange (1981)
- The Case of the Sliding Pool (1981)
- The Case of the Angry Actress (1984)
- The Case of the Murdered MacKenzie (1984)