Bitten

"There is another world touching ours that is filled with demons or, at least, that's what we call them. They call themselves something else entirely, though that is neither here nor there. Every now and again, human beings manage to pull these demons through to our side. The human dies, of course, and the demon gets a person shaped suit to live in. We call these creatures the demonridden."

Only fanatics and lunatics believe demons can possess human beings. Or at least, that's what Callie White thought until one possessed her best friend. Now, wanted for murdering the thing that crawled into her friend's body and dealing with hungers and powers she doesn't understand, Callie White just wants to die. She just has to make sure no one can bring another demon over before she goes. When that proves more difficult than expected, Callie is pushed to her limits and discovers just how common demon possession really is.