1942, Polar region. The Germans are preparing to capture Murmansk. The submarine Sch-721 is considered lucky, and its captain Aleksei Strogov has the ability to extricate himself from the most difficult situations. He also develops tactics for a periscope-free torpedo attack, despite the skepticism of colleagues and management. And now, when the Happy "Pike" had to take on board the crew of another Soviet submarine, and she was on the seabed with almost no oxygen, Aleksei manages to save people and perform the operation, paying for it with his life...

Summer, 1940. Foreseeing the collapse of the Ulmanis regime, the owner of a ship sailing off the coast of Latvia decides to flee the country. Subsequently, the sailors learn about the establishment of Soviet power in their homeland, and the ship changes course...

Follows the turbulent times of the beginning of the century, when Europe and Russia were literally filled with revolutionary moods. Against this backdrop, a love story unfolds. The intelligentsia absorbs the ideas of love of freedom and itself suffers from it. But while romance hovers in everything, feelings remain heightened.