The Painter's Requiem — L. Chambers-Wright

Officer Ian Nelson can't figure Kirsten out. She's young and attractive, but doesn't belong where she is. He isn't certain where she belongs. Several days later, he's tasked with enforcing the order against her, but never has the opportunity. She's gone. She vanished without shoes or purse. No one saw her leave the apartment, which was secured from the inside. The painting she worked on was still fresh, but she was gone.
Six months pass and Nelson is the only person to take any interest in her disappearance. There still isn't any leads or witnesses. As he gets closer to finding her, things change. Things are different in those old places. It isn't long before he's left with more mysteries than hope of resolution.