A Red Army officer Polevoy possesses a navy dirk with a secret message encrypted in its handle. The second part of a message belongs to a White army officer Nikitskiy. It's up to three young friends of Polevoy to uncover the mystery.
Nikitsky
Filin
school principal
Misha's grandmother
Mariya Gavrilovna Terentyeva
Polevoy
uncle Semyon
Genka's father
philatelist
Slavka's father
Misha's grandfather
Slavka's mother
Bandit
Sviridov
Agripina Tihonovna
Genka
Misha Polyakov
Podvolotskaya
Slavka
Misha's mother