After news of the future birth of a child, Sergei split from his wife, Natasha, and settled in the company of young architects, who occupied a room in a big house. As a result of a chain of unforeseen events, brought by one of the tenants found a child, Sergei finds a newborn son. Friends are doing everything possible to find a lost mother, but Sergei does not disclose their affiliation and tries to give the baby the wrong hands.
| Actor | Role |
|---|---|
 Pyotr KirillovHusband, Nikolay | Husband, Nikolay |
 Yevgeniya PyryalovaWife, Natasha | Wife, Natasha |
 Georgy OrlovMalyutka, architect | Malyutka, architect |
 Sergei PonachevnyArchitect | Architect |
 Andrei ApsolonArchitect | Architect |
 Georgi ZhzhyonovArchitect | Architect |
 Mikhail RostovtsevProfessor | Professor |
 Nikolay UrvantsovChildless citizen | Childless citizen |
| KK. Egorov'Crown Prince of the Republic' | 'Crown Prince of the Republic' |
 Elena VolyntsevaOld woman | Old woman |
 Aleksandr MelnikovHousing commission inspector (uncredited) | Housing commission inspector (uncredited) |
| YYuri MuzykantTram passenger (uncredited) | Tram passenger (uncredited) |
 Nikolai CherkasovWaiter (uncredited) | Waiter (uncredited) |