Descended in Vengeance — L.J. Kentowski

Don't call Lexie Pearce a fallen angel-she didn't fall, she jumped. Choosing black wings over a halo was the only way to get the kind of revenge she sought. On a mission to find the vampire who murdered her parents and kidnapped her sister, she's not opposed to using custom-made weapons on anyone who gets in the way.But when a formidable-and magnetically handsome-immortal with sights on her enemy is determined to hinder the mission, she must resolve whether to work with him or find a way to kill him. The problem is, Reis Draeger is like no other breed of immortal she's ever faced, and the road to vengeance may not be her decision to make.