Don't Summon Necromancers - Jeni Conrad - Bog

After Rose takes something deeply important to Hanna, the Seer is determined to hunt the tricky magic user down, no matter what. Hanna pools all her resources together, tugging on any string she can think of, including going to the necromancers and employing the help of a surly ghost named Frank.
When Hanna discovers the necros are also hunting Rose and if they kill her all the enslaved spirits will be trapped forever, she must find the witch first or else risk losing everything that means anything.
Unable to get reliable help from a suspiciously busy Caleb, Hanna turns to the arcanist Phoenix for answers, hoping that the magic user will be able to give at least a hint of where she should go next. Instead, she ends up trapped with the matron of the coven in a bleak spell while Rose is being hunted by necros and free to eat any other ghosts she deems necessary-including a certain sarcastic skater boy.