These hollow vows / Lexi Ryan.

"A heart is a dangerous thing to steal" -- cover.

Brie would do anything before making a deal with the Fae; death is better than their vicious schemes. But when her sister is taken by the sadistic king of the Unseelie court, there is nothing Brie wouldn't do to get her back-including making a deal with the king himself to steal three magical relics from the rival Seelie court. Gaining unfettered access to the Seelie court is easier said than done. Brie's only choice is to pose as a potential bride for the Seelie Prince, Ronan - a prince who's not quite as wicked as she once thought. Unwilling to let her heart distract her, she accepts help from a band of Unseelie misfits with their own secret agenda. But as Brie spends time with their mysterious leader, Finn, she finds herself struggling to resist his seductive charm. Caught between two dangerous courts, Brie must decide who to trust with her loyalty... and with her heart.