Lida Baburova, a tour guide of an architectural museum, unexpectedly receives a warrant for a two-room apartment in the new district of Zarechye, among the new settlers called "our Cheryomushki". Lida and her father go to inspect the apartment, but it turns out that it doesn't exist. The manager of the house, Barabashkin, conducted fictitious documentation, and the Baburovs' apartment merged with the neighboring one, owned by the head of the construction trust Drebednyov.

From childhood, Sanya Grigoryev was able to achieve success in any business. He grew up a courageous and brave man. The dream of finding the remnants of Captain Tatarinov’s expedition led him to the ranks of polar explorers. The life of Captain Grigoryev is full of heroic events: he flew over the Arctic, fought against the Nazis. He was in danger, had to endure temporary defeats, but the hero’s persistent and purposeful character helps him to keep his vow made to himself in childhood: “Fight and seek, find and not give up.”