Tikhon the cat was not just born and lives in the museum - he works here. Museum cat. Security guard and protector. And he is not alone. His parents and his parents' parents, his comrades and brothers - they are all museum cats. But what is there in the wild, outside the walls of the building that cannot be left? What happens inside the museum itself if the whole life of cats is subject to real army rules? And what happens if at least one is broken one day? And the worst will happen... This is not just a story about friendship, honor and devotion to duty, but also a real detective investigation, family drama, and dizzying adventures. This is the first book in a new series about the cat Tikhon from the famous journalist and writer Masha Traub. For primary school children age.