Fourteen-year-old Sonya unexpectedly learns that her mother lied to her about her father's death for many years, and forbade him to communicate with her daughters. Unable to forgive such a betrayal, she runs away from home. Mother and older sister Sasha find Sonya at their old dacha, where no one has visited for many years. Three women are forced to finally talk through all the problems, grievances and fears that have been so carefully hushed up for years. This begins the long journey of restoring family ties.

Andrey loses his beloved dog, and with it the meaning of life. He wanders alone around the city in a fruitless search. One day, a girl appears on Andrey's doorstep and offers to play the role of a dog, taking its place - such psychological help for money. Andrey refuses this crazy idea, but when despair reaches its limit, he... agrees, and the strangest adventure of his life begins.

The beginning of the 1960s, a period of aggravation of the confrontation between the USSR and the USA. In the most difficult weather conditions and with malfunctions on board, the first Soviet nuclear submarine K-3 sets off for a hike under the ice of the Arctic Ocean in order to surface exactly at the North Pole.

In the center of the story are three main characters - Lieutenant Colonel Soshnikov, Captain Muravyov and Major Zakharov. Three ages, three different characters, three different destinies, which are destined to meet at the Khmeimim military base.