The Blood of Crows by Alex C. Pierce

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Ren, a state-trained thief working in a world where everyone has magical ability except for him, doesn’t kill people. Tensions are already high in the walled realm of Lenmar, and when the nobility start dying with no trace of magic that isn’t from the victims, Ren immediately becomes the prime, and only suspect. Hunted by magic-eating Inquisitors and the Captain of the Royal Guard, his life becomes one of flight and fear through a realm on the brink of civil war.

All Ren wants to do is stop a serial killer, clear his name, find his mentor, and protect the people he cares about. To do that, he’ll have to pull one more high-stakes heist— And steal the proof he needs from the very people who want to catch him.