Princely India in the 1930s and '40s enjoyed a golden age which already seems immeasurably distant from the thriving, modern nation of today. These were halcyon days of bejewelled and autocratic Maharajas; life in marble palaces mirrored in lakes or in mighty stone fortresses on craggy hills; tiger hunts on elephant-back and elephant hunts on foot; and lavish house parties ringing with the sound of polo and music and laughter.As heir apparent to...