The central station of Glum City metro: in front of hundreds of people, a criminal with devilish cruelty beats his victim to death. Makeup on his face, a change of clothes, and the surrounding commotion help him escape. The case investigation is assigned to detective Joy Green—an infamous woman whose tragic story everyone knows. Twenty years ago, she and her best friend fell into the hands of sick sadists. Only she managed to escape the captivity of bloodthirsty killers. To deal with the nightmares of the past, Joy had to put in a lot of effort. But something suggests that searching for a new maniac could plunge her into much deeper darkness than she can imagine.