There are 5 books in the Scoundrels series. The newest book is The Mad Earl's Bride which came out in 2013.

1
The Lion's Daughter

Book cover of The Lion's Daughter
Fiery Esme Brentmor is on a mission to avenge her father's death, but her traveling companion, the handsome but irascible Varian St. George, could prove to be a distraction. Original.
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2
Captives of the Night

Book cover of Captives of the Night
Wrongly suspected of murdering her husband, lovely portrait painter Leila Beaumont turns to the enigmatic Comte d'Esmond, a man with a secretive past, for help. By the author of The Lion's Daughter.
Loretta Chase is one of romance's most beloved authors, and now that she's returned to the Avon Family, we're repackaging one of her most popular books with an updated and fresh cover that will attract old and new readers alike. Determined Lady tough-minded Jessica Trent's sole intention is to free…

4
The Last Hellion

Book cover of The Last Hellion
She needed to be tamed...She was a breathtaking firebrand, and Vere Mallory, the notorious Duke of Ainswood, had never seen anything quite like her. Although he thought he was rescuing Lydia Grenville from the clutches of a renowned wastrel, he quickly discovers she is angry at his interference! Amused by…

5
The Mad Earl's Bride

Book cover of The Mad Earl's Bride
Originally appeared in the print anthology Three Weddings and a Kiss (1995).

Gwendolyn Adams is about to propose to an earl. On his deathbed.

Gwendolyn Adams isn't shocked at being asked to save a handsome earl's dying line, even when she learns the prospective bridegroom is seriously ill and possibly…