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Prodigal Summer
Freakangels, Volume 1
Beyond Heaving Bosoms: The Smart Bitches' Guide to Romance Novels
The World Without Us
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When the Duke Returns
Of the first 4 books, When the Duke Returns comes in as my second favorite after Desperate Duchesses. Isidore is my favorite lead heroine thus far in the series (though I suspect Jemma might oust her from that position as I continue to her book), she's a fiery Italian with a big heart and some realistic insecurities about her husband of eleven years that she's never met! Simeon has spent those years adventuring in Egypt and picking up some eccentric behaviors (in the mind of the English court at least).
I liked that this was an atypical scenario for romantic fiction. Rather than the love-at-first sight trope, the book focuses more on Isidore and Simeon working each other into the control they each possess over their separate lives.