Demon Blood (The Guardian Series)

Long before she was transformed into a Guardian and trained to fight demons, Rosalia knew darkness all too well. Raised by a demon, Rosalia learned to guard her heart--and her soul--until she found a man worthy of her love. Once, she thought that man would be the powerful vampire, Deacon...until he betrayed the Guardians.   After losing everything to the lies of a demon, Deacon lives only for revenge--and is taken aback when Rosalia offers to help. A vampire who has nothing--who is nothing--isn't worthy of her attention. But Rosalia wants to do more than just look, and the explosive need between them can't be held in check. And when Deacon's vengeful quest creates a dangerous alliance of their enemies, she will be his only hope...