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Norma Bosquet, who was Marlene's secretary from 1977 - 1992 (during the time Marlene was living in seclusion at 12a Ave Montaigne in Paris, left) has published a memoir about her relationship with Marlene.
You can find more information about the book, "Marlene Dietrich, les derniers secrets" at :
http://www.evene.fr/livres/livre/norma-bosquet-et-michel-rachline-marlene-dietrich-les-derniers-s-28036.php .