In 1900, Edith Wharton burst into the settled summer colony of Lenox. An aspiring novelist in her thirties, she was already a ferocious aesthete and intellect. She and her husband, Teddy, planned a defiantly classical villa, and she became a bestselling author with The House of Mirth in 1905. As a hostess, designer, gardener and writer, Wharton set high standards that delighted many, including Ambassador Joseph Choate and sculptor Daniel Chester French. But her perceptive and sometimes indiscreet pen also alienated potent figures like Emily Vanderbilt Sloane and Georgiana Welles Sargent....