Daindreth's Assassin (Daindreth's Asassin #1)

An assassin falls for the archduke she was sent to kill, but killing him might be the only way to save his soul. Magic has two immutable rules—every spell requires a sacrifice and every curse can be broken. Amira Brindonu is a sorceress turned assassin, bound in a curse that forces her to obey her father, even to the point of high treason. When he orders her to kill the future emperor, she fails, but discovers a secret that could bring the whole of the empire to its knees. The archduke is stricken by a curse that could sentence him and his people to damnation, but Amira could be the only key to breaking it. In a desperate last-ditch effort, the archduke takes Amira prisoner and makes a pact to protect her from her curse if she will help free him of his own.