The film takes place in the pre-war years. NKVD captain Frolov is investigating a sabotage at a chemical plant. Suspicion falls on circus performer Erwin Gross. However, the villainous murder of a clown suspends the investigation. It is only with the help of young circus gymnasts that Frolov manages to establish the truth...
Romualds Ancans
Pauls Butkevics
Givi Chuguashvili
Fyodor Dunayevsky
Olga Bogachyova
