The Shade and His Thief by Adara Wolf

Desperate thief Myth needs one big score to get himself out of a serious hole. Why not steal from his royal father, who refuses to acknowledge him? Unfortunately, the ornate amulet he steals is bad news. Now everybody is out for Myth’s blood.
Callan should be just one of the many people after Myth–but Callan isn’t a person at all. He’s a shade, a creature of shadow and magic. Callan is dark, and dangerous, and even worse news than the amulet itself. His dark, shadowy tendrils reach inside Myth and sate a hunger Myth never knew he had.
Myth finds himself falling deeper and deeper into Callan’s grasp. He’ll lose sight of his goals–he’ll lose sight of himself–if he gives in.
But would that be so bad?