for Shadows by Paula Weston
It's almost a year since Gaby Winters watched her twin brother die. In the sunshine of a new town her body has healed, but her grief is raw and constant. It doesn't help that every night in her dreams she fights and kills hell-beasts. And then Rafa comes to town. Not only does he look exactly like the guy who's been appearing in Gaby's dreams, he tells her things about her brother and her life that cannot be true, things that are dangerous. Who is Rafa? Who are the Rephaim? And who is Gaby? The truth lies in the shadows of her nightmares.
Publisher description retrieved from Google Books.