Central metro station Glum City: in front of hundreds of people, a criminal beats his victim to death with diabolical cruelty. Make-up on his face, a change of clothes and the commotion of those around him help him hide. The investigation of the case is entrusted to detective Joy Green, a notorious woman whose tragic story everyone knows. Twenty years ago, she and her best friend fell into the clutches of sick sadists. Only she managed to escape from the captivity of the bloodthirsty killers. To cope with the nightmares of the past, Joy had to make a lot of effort. But something tells her that working on the search for a new maniac may plunge her into much greater darkness than she can imagine.