There are 4 books in the The Hearts And Thrones series. The newest book is Healer's Touch which came out in 2014.

1
Assassin's Gambit

Book cover of Assassin's Gambit
Vitala Salonius, champion of the warlike game of Caturanga, is as deadly as she is beautiful. She’s a trained assassin for the resistance, and her true play is for ultimate power. Using her charm and wit, she plans to seduce her way into the emperor’s bed and deal him one…
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2
Spy's Honor

Book cover of Spy's Honor
Rhianne, mind mage and Imperial Princess of Kjall, cannot openly challenge the emperor. Instead she acts in secret to aid the victims of his worst excesses. But now the emperor plans to wed her to the cruel Augustan, the man leading Kjall’s attack against the nation of Mosar. Soon she…

3
Prince's Fire

Book cover of Prince's Fire
As the sister of the Kjallan emperor, Celeste cannot choose where to bestow her heart....

The imperial princess has been offered in marriage to the Prince of Inya as part of an alliance needed to ensure Kjall's military prowess. And despite having been hurt in the past by men using…

4
Healer's Touch

Book cover of Healer's Touch
Marius believes himself to be an ordinary small-town apothecary—until the imperial guards show up at his door. Then he learns the truth: he is cousin to the Kjallan emperor. Before he was born, his mother eloped with her beloved, leaving the palace and its intrigues behind. Now Marius returns to…