Based on newly declassified French and German intelligence materials of the war years, the book revealed never-before-told details of how Coco Chanel served the Abwehr as Agent 7124, code-name Westminster. Reports of the designer's covert activities include an attempt, at Himmler's behest, to get a message to Churchill in early 1944 that the SS wanted to broker a separate peace. "Sleeping With the Enemy" was translated into numerous languages and was met with critical acclaim. At the time of his death in 2013, Vaughan had self-published a roman à clef, "A Purple Heart At Far Acre Farm", about his experiences as a 10-year-old spy. Vaughan was a member of DACOR—Diplomatic and Consular Officers Retired, Wash., DC; Association of Former Intelligence Officers; the Paris Cercle de l'Union interalliée; and the National Press Club, Washington, DC. He was also a consultant to the American Hospital of Paris at Neuilly since 1992. A polyglot, Vaughan was fluent in French, had a working knowledge of Italian, and had a passing acquaintance with German, Urdu, and Arabic. Hal Weston Vaughan died October 17, 2013 in Paris. He is survived by his wife, Phuong Nguyen, a physician; his son, Philippe, a security specialist in the Foreign Service; a daughter, Chantal, living in the Washington, DC area; and a daughter, Esther Fantys, an artist and dancer living in Lausanne, Switzerland.