Nancy Mitford was a brilliant personality, a remarkable novelist and a legendary letter writer. It is not widely known that she was also a bookseller. From 1942 to 1946 she worked in Heywood Hill's famous shop in Curzon Street, and effectively ran it when the male staff were called up for war service. After the war she left to live in France, but she maintained an abiding interest in the shop, its stock, and the many and varied customers who themselves...