Flicker and Mist by Mary G. Thompson
Houghton Mifflin Harcourt, 2017
From the publisher: Romance, intrigue, and plenty of action are woven into a rich and suspenseful narrative in this powerful YA fantasy. The mixed-race heroine Myra is a Flickerkin and can flicker (become invisible) at will. She hasn’t cultivated or revealed this ability, since Flickerkin are persecuted as potential criminals and spies. When invisible people become tricksters and then murderers, Myra’s Flickerkin heritage becomes a deadly secret, putting her relationship with the leader’s son—and her own life—in jeopardy. Loyalties shift and difficult choices are made before Myra understands who she wants to be.