Russian detectives unwind the ball of the most intricate and cruel crimes. They are consummate professionals, the best cops in town. Even on the most dangerous missions, this quartet never loses their sense of humor. It is it that helps them find the most incredible ways out of any situation. They uphold the law and emerge victorious.

1938, Soviet Russia. There were two of them, both strong and courageous. But one fateful day, Igor Petrov, the commander of a Red Army unit, is compelled to exchange ID papers with a satecracker known as Ash. The incident leads both men to start their lives completely anew. For the following ten years, Petrov and Ash will live their lives in the fear of discovery. They will commit acts of bravery and insidious crimes in the name of the other so that the thiet becomes a hero, while the commander turns into a violent outlaw. The only thing they have in common is a tragic, painful love for the same woman. For ten years they will each encounter death and destruction before fate brings them together once more. There will be two of them again - strong and courageous, ready to fight for their love.. with the knowledge that retribution awaits them.

The year is 1967. A series of mysterious murders of women are taking place in Leningrad. An experienced KGB major, Chuzhbin, and a police captain, Fedorov, are assigned to catch a maniac who leaves mysterious signs next to the victims.