Martha, at the age of eight, leads a life full of childish worries. The only relative nearby is the grandfather, who needs supervision more than the granddaughter. In order not to end up in an orphanage, Martha hides the truth from a teacher, a district police officer and a glamorous neighbor and asks a loser actor to pretend to be her father. Kazan relatives come to the rescue in the person of adventurer Marat. Only in the plans of the arrogant boy, not caring about the girl, but her Moscow apartments.