A series of mysterious murders takes place in the quiet resort of Petrodar. Visiting scammers are making themselves known loudly. The townspeople are shocked, but they have hope that the killer will be exposed and the guest performers will be caught red-handed. After all, the investigation was entrusted to the staff captain Khitrovo-Kvashnin, whose track record includes several three years as a captain-police officer. He knows how to think logically, find hidden motives and bring villains to light.