Nina is a young woman of thirty years, who lives in St. Petersburg. She has to bury her mother in a winter day. The ceremony is an opportunity for her to meet her younger brother Andrei, who lives elsewhere. He left the parental home ten years ago to prevent their parents from discovering his incestuous relationship with Nina. In spite of their efforts to forget the past, their mutual attraction comes back, and that brings their understanding back together. Although they are adults now, they fail to forget the world of their youth.