Ep. 147: Investigation into the Locked Room Murder of Sam the Spade by the Monster
Aired on September 4, 2000

147
Sam the Spade is found dead in a locked room, having been killed by the "MONSTER." Hajime begins an investigation to identify the culprit responsible for this crime. The narrative focuses on the efforts to uncover the truth behind the murder within the confined setting.
Episodes
- Ep. 143 · The True Identity of the Conductor Is Exposed in the Fifth Russian Dolls Murder Case
- Ep. 144 · Art appraiser attacked after receiving theft warning at secured estate
- Ep. 145 · Inspector Kenmochi visits Akane Island with Hajime, Miyuki, and Fumi
- Ep. 146 · Investigation into the Murder of Ed the Club Under a Giant Barrel
- Ep. 147 · Investigation into the Locked Room Murder of Sam the Spade by the Monster
- Ep. 148 · Hajime Deciphers Burnt Note to Identify the True Killer in the Strange Circus Murders