Drum, or a great reward is promised!

It happened a long time ago. About thirty years ago. In various houses and even cities, as a rule, at night, inexplicable knocks began to be heard. There was a rumor that it was knocking a certain brownie. Drum ...
The drum appeared in Moscow, then in Kaluga, then in Barnaul ... Alarmed locals called journalists and psychics to them: here, listen, and we knock on us ... However, neither the journalists nor the hereditary magicians with psychics did not succeed To determine what kind of mysterious drums these are, and why they knock. But what the journalists and psychics could not, the writers Mikhail Bartenev and Andrei Usachev managed to. According to the fabulous story, the “drum, or a big reward” was promised an audio performance and a feature film was shot