Giulio and Lucia Cesaroni organize the ritual barbecue that marks the end of summer. Among those present are Giulio's inevitable brother, the mechanic Ezio Masetti and his wife Stefania, a friend of Lucia and the principal of the school where they both teach. Obviously Lucia's mother, Gabriella, is also there, while the youngest of the family, Mimmo, observes that this year the doors of middle school are opening for him. For Alice and Rudi, always dog and cat, instead the much more terrifying doors of high school are opening wide! The firstborns Marco and Eva are far away: he studies music in Milan while she is in New York to specialize in journalism and live with her chef boyfriend, Alex. Their friend Walter, son of Stefania and Enzo, is left hanging around Garbatella, drooling over Carlotta, his beautiful girlfriend from the upper neighborhoods. While walking with Rudi, his passion for mechanics leads him to notice a splendid vintage motorcycle that he inadvertently knocks over.