“That Woman: The Life of Wallis Simpson, Duchess of Windsor” (2011, non-fiction) by Anne Sebba.

from The Book People:
"Distinguished biographer Anne Sebba turns her focus to one of the most vilified women of the last century. Neither beautiful nor brilliant, and no longer young, Wallis Simpson became one of the most talked about women of her generation when she captured the king's heart. Based on new archives, That Woman re-evaluates the role of politicians in the affair while shedding new light on the character and motivations of a powerful, charismatic and complex woman."

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