What happens in Vegas stays in Vegas, except when it doesn't. Kitty and Ben return to their werewolf pack in Denver only to discover an invisible evil that smells of brimstone and plays with fire has followed them home. Stalking the whole pack, it leaves a charred trail of ashes and death across the city. Kitty seeks help from Rick, the master vampire of Denver, as well as from the paranormal investigators on a popular reality television show.

But when a mysterious vampire who claims to be a demon hunter - and the only one who can help them - suddenly arrives, Kitty and her allies won't be able to predict what he really wants...or what they must do to extinguish the terror that can torch them all.