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.
In 1930s Poland Christian boy Ivan goes to live with a Jewish family to learn a trade. He becomes friends with Abraham, the son of the family. However, anti-Semitism is rife in their environment, and they flee to escape an upcoming conflict. Journeying together, they demonstrate their inseparability.
Chekist Olga Anisimova, who infiltrated the White Guard center in Harbin, and border guard Aleksei Mogilov prevent a number of provocations on the Chinese Eastern Railway, uncovering a conspiracy between the White Chinese and the White Guard center in Harbin.
