The crocodile Marusya lives in the zoo of the city of Radugorsk. A happy event is coming soon: She incubates six eggs and can't wait for the crocodiles to hatch out of them. But one day she discovers that someone has stolen one of her precious eggs. How can you not get lost here! After all, among the suspects are Varya the magpie, Motya the monkey, Katya the monkey, cockatoo, cuckoo... Schultz the cat and Chiv the sparrow undertake to unravel this difficult matter, and help (or hinder?) They will be police officers and zookeepers. This confusing story will appeal to everyone who loves animals and detective stories.