Dark Triumph (His Fair Assassin Trilogy) by Robin LaFevers

Description

Sybella arrives at the convent’s doorstep half mad with grief and despair. Those that serve Death are only too happy to offer her refuge—but at a price. The convent views Sybella, naturally skilled in the arts of both death and seduction, as one of their most dangerous weapons. But those assassin's skills are little comfort when the convent returns her to a life that nearly drove her mad. And while Sybella is a weapon of justice wrought by the god of Death himself, He must give her a reason to live. When she discovers an unexpected ally imprisoned in the dungeons, will a daughter of Death find something other than vengeance to live for?