In a provincial town on the Volga River, the young and sensitive Katerina marries Tikhon, a violent drunkard, and thus enters the crude milieu of greedy salesmen, the "dark kingdom". Her mother-in-law, Kabanikha, rules the family with an iron fist and endlessly harasses Katerina. One day, when Tikhon is away, she meets Boris, a man who embodies everything Katerina is longing for.