Books like Shadow Kin

Welcome to the Half-Light City.Imagine a city divided. On one side, the Night World, ruled by the Blood Lords and the Beast Kind. On the other, the elusive Fae and the humans, protected by their steadfast mages. A city held together by nothing more than a treaty-and even then, just barely...I was born of a Fae mother, but I had no place amongst her kind. They called me "soulless." An abomination. Perhaps they're right...I'm a wraith, a shadow who slips between worlds. I was given into the service of a Blood Lord who raised me to be his most feared assassin. Still, I'm nothing more than a slave to my master, and to the need that only he can fulfill...Then he orders me to kill Simon DuCaine, a powerful sunmage. In the blaze of his magic, my own disappears. Instead of seeking revenge, Simon shows me mercy. He wants to free me. But that's one thing my master and his kind will never allow.And even if I thought I could trust Simon, stepping from the shadow into the light isn't as simple as it sounds...