A young girl named Michiko is kidnapped and later found dead in a bag. But the kidnapper strikes again. The 18th work from the series "Keishicho Monogatari".

The story of a certain engineer from his youth until he retired from the Japanese National Railways after the war .

An elderly woman, Ume Matsumoto, informed the First Investigation Department that her son Hirasaka, who runs a shoe store, had disappeared. The detectives had a bad feeling which hit the mark, an unidentified drowned body is identified as Hirasaka. Some prime real estate he owned was also mysteriously sold. Suspecting that this is a planned murder and fearing the escape of the criminal, the Department begins to investigate secretly, without creating an investigation headquarters.