Two friendly but mischievous brothers Chuk and Gek live with their loving mother in Moscow and miss their father, who works far in the North. Deciding to meet the upcoming New Year together at all costs, they set off on an exciting journey to the mysterious Blue Mountains. Now they are waiting for the biggest adventure in their lives, because on New Year's holidays any, even the most incredible miracles are possible.

Based on true events, this tale follows the extraordinary bond between a boy and his dog in besieged Leningrad. In 1939, young Mitya finds joy in the companionship of his loyal dog, Karuza. Their idyllic life is shattered when World War II erupts, plunging Leningrad into a brutal siege where starvation looms over its residents. As despair grips the city, Karuza with her keen instincts and unwavering courage ventures into the perilous streets to scavenge for food. Inspired by Karuza’s remarkable bravery, Mitya decides to join her. Together, they are forging a path through despair and hopelessness. However, their efforts take a dangerous turn when they are discovered by German soldiers during one fateful outing.

On the verge of divorce, Max comes to his ex Irina's to pick up his son Dima for the autumn holidays, but then it turns out that the child has run away from home. The worried parents set off in search in the car of family psychologist/Irina's part-time boyfriend Vlad. Learning that Dima ran away to the village to Max's father, Bata, Max recalls, on the drive, how his parents, during their divorce, sent him to the village, about their life together, his first love and childhood friends.