The middle-aged journalist Kovalev finally gets the chance to become the chief editor of the newspaper. Not wanting to tempt fate, the hero turns to the party organizer for support. And then something unexpected happens - Kovalev is bitten in the ankle by a dog, and he becomes a werewolf. Turning into a terrible dog at night, Kovalev has been prowling around the city ever since and instilling fear in his readers. Police officer Vasya Kovalev, the son of an unfortunate journalist, is instructed to find and neutralize the beast ....