Twilight's Edge [Dark Fantasy Romance]

Dragged into the realm of the fae by a monster that stole her brother and her real name, Alys finds herself in the company of a mysterious stranger who takes the form of both a raven and a male faerie by the name of Luthias, who has a binding that restricts his ability to share his past and use the full extent of his magic. As for the monster, it is rumored to dwell in the heart of an enigmatic force slowly spreading across the land, known as the Quiet.

Luthias offers her a deal: he will help her slay the beast and regain her identity, if she helps him in return -- but before she can do that, she is tasked with carving herself out a place in a realm to which she does not belong, with no way through other than staining her hands with blood.