Night Angel Nemesis

After the war that cost him so much, Kylar Stern is broken and alone. He' s determined not to kill again. But Kylar's best - and maybe only - friend, High King Logan Gyre, needs him. To protect a fragile peace, Logan's new kingdom and his twin sons, he needs Kylar to secure a powerful magical artefact that was unearthed during the war.
Adversaries both old and new are on the hunt for this relic, but if Kylar does the job right, he won't need to kill at all. This isn't an assassination - it's a heist. But some jobs are too hard for an easy conscience, and some enemies are so powerful the only answer lies in the shadows.