Magic on the Line — Devon Monk

Allison Beckstrom has willingly paid the price of pain to use magic, and has obeyed the rules of the Authority, the clandestine organization that makes-and enforces-all magic policy. But when the Authority's new boss, Bartholomew Wray, refuses to believe that the sudden rash of deaths in Portland might be caused by magic, Allie must choose to follow the Authority's rules, or turn against the very people for whom she's risked her life.

To stop the plague of dark magic spreading through the city, all that she values will be on the line: her magic, her memories, her life. Now, as dead magic users rise to feed upon the innocent and the people closest to her begin to fall, Allie is about to run out of options.