(from ebookjapan):
The Kusakabe Police Department's Documentation Division is also known as the "Labyrinth Division. Chief Kanzaburo Torii, commonly known as "Omiya-san," takes supreme pleasure in finding "lost rings" in cold case files that the detectives in charge have never noticed. The chief's daughter, Yoko Nanao, a new policewoman, has been assigned to the archives section. Although Yoko is placed in a safe department out of parental love, she is not happy with her new job as a detective...? The work was also the basis for a TV drama starring Ken Ogata and Tsunehiko Watase.