In 1971 the USSR State Prize for this film was awarded to Sergei Gerasimov, cinematographer Vladimir Rapoport, art director Pyotr Galadzhev, and the group of leading actors: Oleg Zhakov, Vasily Shukshin, Natalya Belokhvostikova.

Barmin and his team staunchly oppose the project, fearing the plant's wastewater will irreparably damage the delicate ecological balance.

However, Vasily Chernykh, the plant's director, advocates for building an innovative wastewater treatment system alongside the mill to mitigate environmental harm.

Lena initially grows closer to Chernykh, but when she learns of his marriage, she decides to end their relationship, prioritizing her principles and future.

Meanwhile, Professor Barmin’s unyielding stance against the project takes a toll on his health, culminating in a heart attack that forces him into the hospital.