Over forty years have passed since the murders. Several diligent amateur detectives have been trying to figure it out. The case of serial murders, which took place in 1936, is popularly known as the Tokyo Zodiac Murders and is one of the most peculiar and elusive mysteries in the history of crime. The case remains an utter mystery. A duo, Kazumi Ishioka and Kiyoshi Mitarai, are compelling characters; Kiyoshi's sardonic wit and sharp intellect contrast sharply with Kazumi's. Their dynamic adds depth to the process of solving the mystery of the Umezawa family genocide.
Heikichi Umezawa was such a maniac about his art. He was found dead in his studio behind a locked door. He happened to leave a "document" about his fascination with creating a perfect woman named Azoth. There was no evidence left at the scene, and his daughters and nieces, who did not have strong alibis, were brutally killed months later. They were buried in different places, and each body had been cut up in a different way, exactly as described in Heikichi's last cryptic notes.
A woman visited Kiyoshi to tell him about a shocking incident in which her father was used by some criminals involved in Heikichi's case. After her father passed away, he left behind a confession that enlightened Kiyoshi about the cold case.
TTZM belongs to the classic Japanese honkaku subgenre of murder mystery. It prioritizes fair-play puzzles where readers are encouraged to solve the crime alongside the detective based on the clues given. I rated it 4.5 ⭐️ for its masterful plotting and engaging mystery.