THE DISCOVERY THAT ALMOST WASN’T
LADY FIONA HERBERT, the eighth Countess of Carnarvon, turns the folio pages of a leatherbound guest book, pointing out the signatures of illustrious visitors who frequented her famous home a century ago. We are high in Highclere Castle, the grand country estate some 50 miles west of London that in recent years became the setting for the popular period drama Downton Abbey. Now every table, chair, and much of the floor in Lady Carnarvon’s small study is stacked with books and original documents from the 1920s: letters, diaries, and yellowed photographs mounted in albums or rolled up like ancient papyrus scrolls. The guest register contains the cast of characters for a book Lady Carnarvon is writing about her husband’s forebear, George Edward Stanhope Molyneux Herbert, the fifth Earl of Carnarvon.…