The Gerasimov family is large and friendly. Pavel is an architect, father of five children, dreams of a sixth. The only thing that interferes with happiness is the cramped Moscow apartment in which the heroes live. Inspired by this pain, Pavel is developing a residential complex for large families. Developer Lev Borisovich likes the idea of the Kovcheg residential complex, but only as a way to attract attention to the project. This puts Pavel in front of a difficult dilemma: to increase his living space by deceiving poor fellows like him, or to come into conflict with a very serious person. The family realizes that they are not capable of bargaining with their conscience, sells the apartment and leaves the city. They settle in the old house where Pavel's ancestors lived and decide to build their own "Ark" with their own hands. This choice turns the family's life into a real adventure, revealing to them the power of a large, friendly family and each of its members individually.
