Dark Triumph by Robin LaFevers

Sybelle, assassin of the convent of St. Mortain, is Death's daughter--but she's also the daughter of d'Albret, who would kill you if the shadows on your face hinted of your disloyalty. Or maybe just because. In the war for Brittany to remain separate from France in the late 1400s, the convent takes the side of Brittany, and sends forth its assassins, including Sybelle, to murder those who are marqued for death.

Sybelle, however, is not easily led. She struggles with the rules of the game; she's not nearly the pawn others would have her be. When she has to flee with a mysterious knight who's been held in a secret dungeon, her mask is torn away, and she must fight openly. And somehow, she must be willing to face Death and all its attractions head on.

What makes this book tick:
1. Sybelle, Katsa, and Katniss deserve a quiet retreat together....
2. Subtle meditation on identity and faith wrapped up in a violent war setting.
3. Romance that does not require the heroine to take a back seat.