A simple Russian woman, having lost her husband and son, found herself in another family and raised someone else's child... Maria has been living with the Alimov family for over thirty years. Fate once brought her together with Larisa Alimova, who, due to illness, could not raise her son, Petya.

A girl named Venya Ryzhik, living in an orphanage after parents abandoned her as an infant, creates "The test tube babies' league" with her orphan peers, declaring their refusal to find the foster family and protesting the apathy of their neglectful parents

Not young bus driver goes to the next trip. In this trip he recalls his childhood during WW2. But there is another danger people among passengers of the bus.