Faery moon

the long version

Tess Noncoire , successful fantasy writer and Celestial Blade Warrior, has gone to a writers' conference in Las Vegas, taking along her mother, who is depressed over the death of her demon husband. Taking in one of Vegas' Big Acts, Tess is amazed to see winged dancers flying about the stage, seemingly unsupported by any wires. Then she discovers the dancers are actually faeries, held captive in the casino against their will. And if Tess and her sidekick demon Scrap don't help the faeries return to their own dimension, they--and their realm--will die.