The famous detectives Leato and the fat, intelligent cat Feofan have long earned their well-deserved fame, so it's not strange that a morning visitor came to ask for their help. True, this time the client was somehow strange and clumsy, but his request clearly deserved attention - his master's son disappeared without a trace, and the inconsolable father was in despair. Leato and Feofan immediately leave to investigate, but from the very first minutes everything seems suspicious and incomprehensible to the detectives.