It was, in 1947, that rarest of unions: a royal love match. But though the dashing Prince Philip of Greece and the 21-year-old heiress to Britain’s throne were clearly besotted as they began a life and family together, trouble lay ahead as “Lilibet” became “Her Majesty” and the new Duke of Edinburgh chafed at his consort role. In an adaptation from her biography—timed to the monarch’s Diamond Jubilee—Sally Bedell Smith describes the dynastic struggle that rocked Queen Elizabeth II’s marriage and the difficult choices she was forced to make.