A new hobby has appeared among the youth of the city of Severoelansk: students, young officials, and even young ladies from noble families, wearing special sashes, climb rocks. And none of them knows that in their favorite Black Settlement there is a whole gang hiding... It is well organized, it is led by an unusually cunning and insidious person. Detective police agent Alexei Polyakov managed to reach her, but the leader could not be captured. And Alexey has irrefutable evidence that he was involved in a series of terrible murders that shook Severoelansk and the surrounding area. The villain changes names and professions, but cannot change only one thing - his past. But it was this man’s past that allowed Alexei Polyakov to take his trail...