Police captain Ekaterina Petrovskaya quickly descended the stairs. Rusty railings, rusty steps... Only now did she realize that she had made a terrible, unforgivable mistake: she had not told Colonel Gushchin where she was and what she was going to do. What is she going to do? To enter a closed, guarded department store full of goods, at night, behind the scenes, after the killer has been caught, exposed by evidence and has confessed to the crime. But what then to do with that call for help? “She can still be saved!” Katya was very scared. Alone, in a huge store where so many murders took place... Katya moved quietly and carefully. She must find out what evil has been lurking here ever since it went unpunished and unsatisfied...