A murder just happened and it seems the answer is simple on who and how did it. But a casual talk between suspect's mother and prosecutor sets a different point of view on a just opened case.
Factory director Kungurtsev returns from a trip abroad and finds out that his longtime and only friend engineer Alexei Putyatin is going to marry Vera, who is very different from everyone's beloved Lipa, Alexei's first wife.
Two old Leningrad workers, Sukhov and Solyanov, have a long-standing friendship — they worked at the same plant, lived in the neighborhood. Now Solyanov, at the insistence of his son, decides to retire. But it is not so easy to part with his native plant, which, as it turned out, still needs an old personnel officer...
