The true story of the most famous and bloodthirsty gang of the Stalin era, 'Black Cat', which kept the post-war Moscow in fear. The bandits were seen, their names were known, but they were elusive, because no one could even imagine that the criminals were hiding among the best Komsomol members. At day, they led a normal life of Soviet youth, studied, played sports. And at night, the gang controlled not only their hometown, but also the whole Moscow. It took investigators a few years to track down and wipe out the gang. Captain Viktor Karatov, the new head of the criminal investigation department, arrives in Krasnogorsk. He meets a daughter of his deceased war comrade Taya and falls in love with her. But the girl has a boyfriend - a shock-worker, exemplary Komsomol member, captain of the local football team Ivan Mishin. Taya breaks up with Mishin and, together with Karatov, moves to Moscow. Soon Victor is placed on a special investigations unit on the case against the Black Cat.
