They call her the 'Dark Angel'. Queen of Tokyo's underworld, Mme Midorikawa is famed for her beauty, her jewels and the tattoo of a black lizard on her arm. Crime is so easy for her that she warns her victims in advance. When a wealthy jewel merchant receives letters saying his precious daughter Sanae is about to be kidnapped, he entrusts the renowned detective Akechi Kogoro to protect her. But he may have met his deadliest adversary yet...