True Angel by Jessica Lynch

Halo or horns?

Avery’s older sister is missing. All she has to go on is a psychic’s warning, a wolf print left in mud, and Heather’s abandoned cell phone. A feral shifter has snatched her sister and she’ll do anything to get her back—even rely on paranormal help.
And that’s when she meets Cam.

Camiel is an Othersider. Formally known as one of the Fallen, his only goal in his Earthbound existence is earning a halo and ascending up above as a true angel. With his cat-shaped auditor at his side, he works to tilt the scales in his favor. It’s all about earning enough points to keep him from becoming a demon who spends eternity in the down below. He’ll do anything to prove that he’s good—even if his darkest urges prove that he’s not as good as he seems.

So when the gorgeous mortal approaches him for help in rescuing her sister, he accepts the job, hoping that it’ll be enough to put him over. And maybe it would’ve been, if it hadn’t been for the curse…