There are 2 books in the A Novel of the Borgias series. The newest book is The Lion and the Rose which came out in 2014.

1
The Serpent and the Pearl

Book cover of The Serpent and the Pearl
A gripping novel about history’s most infamous family—The Borgias—and an innocent girl pulled into their treacherous rise to power, from the New York Times bestselling author of The Alice Network and The Diamond Eye.

Rome, 1492. The Holy City is drenched with blood and teeming with secrets. A pope lies…
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2
The Lion and the Rose

Book cover of The Lion and the Rose
From the New York Times bestselling author of The Alice Network and The Diamond Eye comes the continuing saga of the ruthless Borgia family that holds all of Rome in its grasp, and the three outsiders thrust into their twisted web of blood and deceit…

As the cherished concubine of…