Keizoku, also known as Unsolved Cases, is a Japanese mystery thriller created first as a TV drama and later as a film. It is about Detective Shibata Jun, who handles unsolved cases with her hardened partner Mayama Tooru.
The television series was broadcast in eleven episodes between 8 January and 19 March 1999. A two-hour "special drama" was then broadcast on 24 December 1999. The series has been called "epoch-making" in the police procedural genre on Japanese television
