Bad Angels by Dennis Danvers

Shannon's a fallen angel. Hunted. Hiding. Her crime? She'd rather live on earth with humans and exercise free will. On the streets, Shannon keeps her wings tucked inside a hollowed out backpack and taps the will of young men. Nothing harmful. Just enough to get what she needs--until she meets George, an angel-obsessed artist, in Richmond, Virginia. Now she's in trouble: tapping wills can work both ways.Peter Arrowsmith is the archangel's investigator, in charge of the problem of the fallen, and he's closing in on Shannon. Trouble is, Peter's slipping into an entanglement of his own with Bethanie, a beautiful, compulsive liar. As Shannon flees and Peter pursues, they draw a group of misfits into their deadly battle. But as both angels and humans will learn, love can make a tragedy or a farce of even divinely inspired plans.