The Deceiver's Heart

Now firmly on the side of the Coracks, Kestra Dallisor plans to use the magic Olden Blade to kill the evil Lord Endrick. When she fails, Endrick turns her into one of his Ironheart soldiers: without any memory of her rebellion, and bound to obey him, his spy within the Coracks. The rebel Simon is desperate to return her to the Kestra he loves, but he is reluctant to use the magic that would either heal or destroy her. Neither Simon or Kestra is sure who they can trust among the rebels, because the whole rebellion is endangered by its increasingly murky politics. -- adapted from run-on sentence provided