An orphanage resident, Nikita, flees justice to Moscow, where he meets Den, a rich orphan who offers Nikita a ticket to a better life in exchange for his friendship. Nikita agrees, not knowing what price he will have to pay for it.
When a Russian submarine vanishes in the Greenland Sea, Commander Viktor Voronin leads a rescue mission to find his brother. Meanwhile, a Kraken monster emerges after a polar station's destruction.
Fyodor, Pavel and Mikhail are three friends in pre-war Leningrad. Fyodor works as a tuner at the conservatory, Mikhail studies there in the bayan and accordion class. The story reflects real events and people who gave their lives for the future of the Soviet Motherland during the Great Patriotic War, defending Leningrad during the difficult months of the blockade.
