Seven year old Sasha practices violin every day to satisfy the ambition of his parents. Already withdrawn as a result of his routines, Sasha quickly regains confidence when he accidentally meets and befriends worker Sergei, who works on a steamroller in their upscale Moscow neighborhood.

The lost dog Kashtanka is picked up on the street by circus actor Monsieur Georges. He gives her a new name - Aunt and, having prepared a number with her, begins to perform in the circus. Their performances are very successful.