The main participant in the secret police experiment "Undercover Taxi" Alexei Turbin enters into a deadly battle with a gang terrorizing the city. Every day he patrols the streets in a specially equipped taxi and simultaneously conducts a personal investigation. Colleagues consider the Turbine to be a magnet for trouble — because it constantly finds itself in the epicenter of events. But it is this quality that helps him solve the most complicated crimes.

The series concerns the everyday lives of the operatives of the "murder" department of the Petrovsky District Department of Internal Affairs of St. Petersburg.

Police captain Pavel Semyonov serves in one of the residential areas of St. Petersburg. Pavel is used to breaking up drunken fights and entering drug dens alone to make another arrest. He knows that if he thinks and argues, he will simply be killed. And he is used to first acting, and then sorting it out, because he really wants to stay alive, because his wife Yulia and son Sasha are waiting for him at home. Risking his life, he saves the daughter of a businessman. In gratitude, Latyshev, the girl's father, facilitates the transfer of Pavel to Nevsky Prospekt, to the very center of the big city, where it is prestigious and profitable to serve ... And soon Pavel begins to suspect that his transfer to the Central District was carried out by Latyshev with some far-reaching plans. And when Pavel goes on the trail of a mysterious killer named Rafael, everything is completely confused. But in a difficult situation, Pavel can always rely on his friends from the sleeping area