On holiday in Yalta, Muscovite banker Dimitri Gurov contrives to meet a young woman who walks her dog. She's Anna Sergeyovna, trapped in a loveless marriage to a lackey. He's unhappy in an arranged marriage. With neither spouse at hand, Dimitri and Anna begin an affair. After a short time, she returns to Saratov, he to Moscow, believing it's good-by forever. All winter he is miserable, enervated, distracted by tristesse. In desperation, he contrives to go to Saratov, surprising her at a concert. Fearing discovery in her home town, she promises to come to Moscow. Will they cast...