After the war, young yachtsmen from the coastal town deal with daily work, training and competitions without knowing about the downside. Suddenly, mysterious events start to happen, testing the vigilance, ideological and moral beliefs of the local people.

The famous textile worker Natasha Abrikosova travels from Moscow to Tashkent to introduce the innovative method of the Vinogradovs at a textile mill (E. Vinogradova was the film's technical consultant). However, the director of the plant, Rizaev (a hidden enemy), is trying with all his might to thwart Abrikosova's plan. Having chosen Asal as her assistant, the girl soon achieves a record output and, thereby, provokes Rizaev to an open crime.