Magic Without Mercy by Devon Monk

Allison Beckstrom’s talent for tracking spells has put her up against some of the darkest elements in the world of magic. But she’s never faced anything like this.Magic itself has been poisoned, and Allie’s undead father may have left the only cure in the hands of a madman. Hunted by the Authority—the secret council who enforces the laws–wanted by the police, and unable to use magic, she’s got to find the cure before the sickness spreads beyond any power to stop it.But when a death magic user seeks to destroy the only thing that can heal magic, Allie and her fellow renegades must stand and fight to defend the innocent and save all magic…