Plot synopsis: A seriously ill patient is brought to the clinic of a research institute. Young doctor Falko, a resident at the institute, insists on an urgent operation, but his supervisor Druz believes that in this case therapeutic treatment will be more effective and, moreover, will not be associated with risk. Professor Shostenko nevertheless undertakes to operate on the patient. The successfully completed operation confirms the diagnosis made by Falko. Parallel to the events in the clinic, the action unfolds in the house of the director of the institute Shostenko, where his son Igor returns after a three-year absence. The complicated relationship between Igor and his wife, the love story of Shostenko's daughter and Druz - the canvas of the second plot of the film.