A series of stories about the Siberian adventures of investigator Oleg Beroev. The story “Cold Waters of the Arctic” tells about a journey through the stormy Laptev Sea and the Lena Delta to the Evenki village of Ystannakh-Khocho, where the foundation of the country’s northernmost school is underway. Along the way, crew members die one after another under mysterious circumstances. And Beroev takes up the investigation. “Incognito from the Ministry of Internal Affairs” touches on corruption cases and cases of poaching among high-ranking officials. And “Swamp Grandfather” is the story of the search for a uranium mine and an abandoned death camp in Transbaikalia. Beroev leads his comrades through the swamp and comes out to an unknown village surrounded by an impassable swamp. And soon her owner appears - the mysterious and formidable Swamp Grandfather, from whom few have ever escaped.