Kaylee and Nash discover that one of his football teammates is addicted to Demon's Breath, a dangerous Netherworld substance that shouldn't even be available in the human world. To save their friends from insanity--and possibly death--they must figure out how the Demon's Breath got into their world and somehow dispose of it, as well as cutting off the supply--without socially alienating themselves. And in the course of their investigation, Kaylee discovers a deeper plot by a powerful Netherworld demon to open a path between the worlds and pull humans into the Netherworld so that he can steal their souls and imprison their bodies. Along the way, she also discovers someone close to her has been hiding a deadly addiction as well...