An accident occurred in the spinning shop of the melange mill. Worker Zoya Semenova was seriously injured. Some colleagues blamed the shop manager, Galina Demidova, for the incident, and an investigation began. The case was assigned to investigator Sukhobokova, an honest and principled woman. During the investigation, Sukhobokova meets with workshop workers and Demidova’s friends, who don't believe in Galina’s guilt...