The Liminal People
From the Publisher:
Taggert can heal and hurt with just a touch. When an ex calls for help, he risks the wrath of his enigmatic master to try and save her daughter. But when Taggert realizes the daughter has more power than even he can imagine, he has to wrestle with the very nature of his skills, not to mention unmanned and uncreated gods, in order keep the girl safe. In the end, Taggert will have to use more than his power, he has to delve into his heart and soul to survive.