The lives of Mika and her husband, celebrated pianist Andre Polonski, are interrupted by the unexpected arrival of Jeanne, a young woman who has learned that she almost had been switched at birth with Polonski s son in the hospital. Also a pianist, Jeanne speculates that she may be Andre's daughter. Her suspicions further aroused by Mika s behavior, Jeanne begins the dangerous task of unraveling a dark web of family secrets and lies.