The Oblonsky family of Moscow is torn apart by adultery. Dolly Oblonskaya has caught her husband, Stiva, having an affair with their children's former governess, and threatens to leave him. Stiva is somewhat remorseful but mostly dazed and uncomprehending and is unable to persuade his wife to forgive him. Stiva's sister, Anna Karenina, wife of the St. Petersburg government official Karenin, arrives at the Oblonskys' to mediate. Eventually, Anna is able to bring Stiva and Dolly to a reconciliation. Upon her arrival in Moscow, Anna meets Vronsky and becomes infatuated with him.