Sviatoslav Richter was a dazzling performer but an intensely private man. Though world famous and revered by classical music lovers everywhere, he guarded himself and his thoughts as carefully as his talent. Fascinated, author and filmmaker Bruno Monsaingeon tried vainly for years to interview the enigmatic pianist. Richter eventually yielded, granting Monsaingeon hours of taped conversation, unlimited access to his diaries and notebooks, and, ultimately,...