The Gromov family — grandmother Vera Egorovna, her daughters Ira and Lisa, and pregnant granddaughter Olya with her henpecked husband Tolik - have lived all their lives in the center of St. Petersburg in a large communal apartment. Finally, they decide to separate and spend their shares in the apartment in their own way. But when collecting documents, it turns out that Dima is still registered in the apartment — Ira's ex-husband and Olya's father, an alcoholic and manipulator who left the family a long time ago. A long search for Dima leads to nothing, and suddenly he himself appears on the threshold of the communal apartment. Gromov will not just have to say goodbye to his plans, but also live with Dima, who arranges drunken antics and antisocial behavior every day. It doesn't work out well to get rid of him, and out of desperation, the women decide that Dima should be killed.