The mother refused her newborn daughter and threw her on the doorstep of a neighbor when the baby was only nine days old. The girl has grown up and is now sure that she has found the sons of her mother-cuckoo. But the brothers are convinced that their mother never had a daughter, and the father confirms this. Will the terrible truth about the brothers' mother be revealed, or does a resident of Novosibirsk need to look for another family?