Max is a skeptic to the core. He does not believe in the supernatural, unlike his girlfriend, a journalist who writes articles about exactly this. One day she asks to accompany her to an interview with a former organizer of a swamp tour. The tour specializes in “goblin fishing”, and people strangely disappear on it. The organizer looks scared and sells Max an antique knife for next to nothing, just to get it off his hands quickly. After which the eyewitness Leshy dies, and the girl ends up in a psychiatric clinic. To find out all the circumstances of what happened, and to bring those responsible to justice, Max sets off in the footsteps of the girl, which lead to the Kuzminsky swamps. But he could not even imagine what events and people awaited him on this far from pleasure journey. They will shake his skepticism, open up his abilities, and force him to learn a lot of new things about the world and himself. And perhaps they will answer the questions: what kind of knife did he stupidly buy from a strange man who saw Leshy with his own eyes, and does Leshy really exist?