The Maiden And The Mercenary (Lovers and Legends, Book 10) by Nicole Locke
Keep your friends close...
And your enemies closer?
In order to find a legendary treasure map, mercenary Louve of Mei Solis must infiltrate his enemy's fortress in the guise of a servant. There, Louve meets beautiful maiden Biedeluue, a fellow servant with her own hidden agenda: to save her sister from the malevolent Lord's clutches! Their high-stakes missions might be at odds with one another, but their attraction cannot be denied even in this most dangerous of situations...