It was the glittering intellectual world of 1920s Paris expatriates in which Pauline Pfeiffer, a writer for Vogue, met Ernest Hemingway and his wife Hadley among a circle of friends that included Gertrude Stein, F. Scott Fitzgerald, John Dos Passos, and Dorothy Parker. Pauline grew close to Hadley but eventually forged a stronger bond with Hemingway himself; with her stylish looks and dedication to Hemingway's writing, Pauline became the source of...