Nine-year-old Timka lives happily in the city on the Oka River with his dad Misha, his wife Zina, his cousin Vovka, his friend Senka and his beloved dog Runa. An early meeting with his father - captain of the first rank Anton Trubnikov - does not please him, but frightens him. The captain's heart is also worried. She and her son were separated for six years. There was a short meeting before Timka entered school. But the boy did not recognize his father. The captain, who survived more than one accident on a nuclear submarine, faces serious treatment with an unknown outcome. How will they meet? Will the same closeness between them reappear?