Gennadi Kuprianov (Innokenti Smoktunovski) works on a construction site. After constant quarrels with his wife, the hero leaves the house to go to nurse Zina. His son Sacha also works on a construction site. He doesn't like Guennadi and the young man doesn't know how to free his mother from the anguish and bitterness that entered the house with the arrival of this strange man. The young man began to visit his new friend more and more often. Attentive parents, calm and intelligent conversations, material well-being - everything here attracts the young man. However, the head of the family, head of a city department, has long worked for a group of crooks operating in the commercial network, with this group Gennady Kuprianov turned out to be involved.
