There are 3 books in the Taj Trilogy series. The newest book is Shadow Princess which came out in 2010.

1
The Twentieth Wife

Book cover of The Twentieth Wife
An enchanting seventeenth-century epic of grand passion and adventure, this debut novel tells the captivating story of one of India's most legendary and controversial empresses -- a woman whose brilliance and determination trumped myriad obstacles, and whose love shaped the course of the Mughal empire.
She came into the world…
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2
The Feast of Roses

Book cover of The Feast of Roses
Contines the story of the life and times of Mehrunnisa, the wife of Emperor Jahangir of the Mughal Empire during the seventeenth century.

3
Shadow Princess

Book cover of Shadow Princess
The daughters of Emperor Jahangir, Jahanara and Roshanara, plot and scheme against one another in an attempt to gain power over their father’s harem. As royal princesses they are confined in the imperial harem and not allowed to marry. However, this does not stop them from having illicit affairs or…