Kazakh scientist and traveler, Chokan Valikhanov studied at St. Petersburg University and was well known in Russia. When sent to war against the Kazakhs, Valikhanov was forced to make a choice between Tzar and native land.

Set during the 1939–1940 Winter War, the film follows a group of young women from Leningrad who volunteer for service at the front. Working as nurses in hospitals and on the battlefield, they devote themselves to saving the lives of wounded soldiers, while also taking up arms alongside the men in combat. Through hardship and sacrifice, their courage forges bonds of friendship and love that endure amid the trials of war.

The teenager Misha Polyakov, being with his mother in a Ukrainian village on vacation with his grandmother and about to return home to Petrograd, offers his best friend Genka to go with him. Suddenly, a white gang of Nikitsky bursts into the village and attacks Misha’s house, where Commissioner Polevoy lives. The purpose of Nikitskiy (aka Nikolskiy) is a dagger located at Polevoy. Saving the commissioner, Misha learns from him the history and secret of the weapon, and receives it for storage with a request to solve the secret. Having returned with adventures to Petrograd, Misha Polyakov with friends begins to unravel the riddle of the dagger, in the handle of which is encrypted text.

Based on Hans Christian Andersen's The Emperor's Nightingale and The Emperor's New Clothes.