Marlene Dietrich never threw anything away. She kept her good-luck rag doll (it appeared with her in The Blue Angel and followed her to dressing tables on every movie set). She kept the letters she received from, friends, colleagues, lovers, and her husband of fifty-three years. She kept every article of clothing made for her by the great French couturiers and many from legendary Hollywood costume designers. She kept everything. After Dietrich's death,...