Eugene Onegin opens with the titular protagonist inheriting his uncle's estate after leading a dissolute life of balls and boredom in Saint Petersburg. Bored by country life, Onegin befriends Vladimir Lensky, a romantic poet engaged to the lively Olga Larina. Lensky introduces Onegin to Olga's introverted, bookish sister, Tatyana, who promptly falls deeply in love with the sophisticated newcomer. Tatyana pens a passionate, frank love letter confessing her feelings, but Onegin rejects her advances with cold, paternalistic detachment in a garden meeting.
Tensions escalate during a winter nameday celebration for Tatyana when a bored Onegin flirts deliberately with Olga to provoke Lensky. Enraged by this breach of etiquette, Lensky challenges Onegin to a duel. Despite misgivings, Onegin accepts and fatally shoots the young poet, leaving him dead in the snow. Stricken with remorse, Onegin flees the estate and embarks on years of aimless wandering across Russia to escape the memory of his dead friend.
Meanwhile, Tatyana visits Onegin's abandoned study, where she reads his heavily annotated books and begins to understand the complex, cynical mind of the man she loves. Her mother subsequently transports her to Moscow to find a husband among the high-society marriage market. During a grand assembly, Tatyana captures the attention of an affluent, influential prince whom she eventually marries, transforming into an elegant and composed aristocrat of the highest social standing.
Years later, Onegin returns to Saint Petersburg and attends a high-society ball where he is stunned to encounter Tatyana as a reigning princess. Realizing the depth of his feelings too late, a transformed and lovesick Onegin bombards her with ardent letters and pursues her relentlessly. Onegin tracks her down to her home, where he finds her weeping over his notes and declares his burning passion at her feet.
Tatyana acknowledges her enduring love for him but firmly rejects his advances, reminding him of his former coldness and her absolute loyalty to her husband. She insists that their paths are permanently severed and departs, leaving Onegin alone and devastated by the consequences of his past choices.