Russian painter, explorer, and mystic Nicholas Roerich (1874-1947) ranks as one of the twentieth century's great enigmas. Despite mystery and scandal, he left a deep, if understudied, cultural imprint on Russia, Europe, India, and America. As a painter and set designer Roerich was a key figure in Russian art. He became a major player in Diaghilev's Ballets Russes, and with Igor Stravinsky he cocreated The Rite of Spring, a landmark work in...