Мосгаз. Дело № 10. Метроном

The year is 1982. Sonya Timofeeva, Alexey Garkusha and Egor Osadchy are now on their own, and ambitious Major Viktor Kovalev is trying to take the empty place of the head of the task force.

Meanwhile, in Moscow, Andrei Grinyakin, a well-known pop artist and employee of the Moscow Concert, dies right during the performance. Everything indicates that someone is trying to "hush up" this case. Sonya Timofeeva, in secret from everyone, begins to conduct her own investigation. Kovalev is also trying to understand what is happening in the Moscow Concert. It is obvious that the underground activities of Mosconcert are covered by influential people.

Events are unfolding rapidly: one by one, the participants in the criminal scheme of the director of the Mosconcert Olshevsky are killed.