Murder In Georgetown ($23.95; Oct. 1; 256 pp.; 0-312-24221-2) Another trip to the author’s posthumous vault takes his mother, First Lady Eleanor Roosevelt (Murder in the Map Room, 1998, etc.), back to 1935, when Federal Reserve governor Sargent Peavy is murdered. Eleanor, taking the word of his distraught lover, Huey Long staffer Jessica Dee, over that of the officers who arrested her, snoops discreetly into the case on her considerable own.