The Necromancer's Return (The Necromancer's Inheritance) (Volume 2)

Rose has sworn off necromancy until a college statistics assignment sends her to a graveyard. Her entire grade depends on the assignment, so she uses her magic to convince the slackers in her group to help. When her powers don't work like they should, Rose discovers that there's another necromancer in Albuquerque whose inexperienced magic is affecting hers. Worse, she discovers there's a being called the Phantom who is devouring spirits and gunning for her and her powers. As if statistics weren't hard enough already, Rose has to track down this other necromancer and keep herself and her family safe from the Phantom.