The investigator of the Moscow IC Sergey Kovalev investigates the murder of Colonel Evseev and his family, hiding the fact that Evseev is his half-brother. Meanwhile, there are new murders with a similar handwriting. During the investigation, one of the murder weapons is found at the scene of another crime. The fingerprint on the knife is identical to the fingerprint left at the scene of Evseev's murder. This fact becomes a key turn in the investigation.—Kino-teatr