"Clara and Mr. Tiffany," by Susan Vreeland (Random House, 432 pp.) Vreeland, author of 鈥淟uncheon of the Boating Party,鈥 once again builds a novel around the life of a famous artist and a major piece of art. This time her story, set in New York鈥檚 Gilded Age, imagines the Tiffany leaded-glass lamp as the creation of Clara Driscoll, the studio manager of Louis Tiffany Comfort. (January)