The Witch of Benbar's Cross by Tanya Meeson

Morgan Cadogen’s twin sister, Juliet, has disappeared in a desert town at the far end of the world.

All Morgan knows for certain is that Juliet went to Benbar’s Cross chasing a theory about shamanism.

But when she arrives in the near-deserted settlement, she makes an unsettling discovery: not only is there no sign of Juliet, but according to the last few locals, she was never there.

With nothing to go on but her intuition and a few shreds of evidence, Morgan follows the crumbs that lead her to the horrifying truth about Juliet’s disappearance—and what she will have to sacrifice to get her sister back.