Allison Carter is a private detective. Her beat: the end of the world, or more accurately, preventing same. With an attitude of "shoot first and the hell with the questions," she leads a life that would make other investigators give up. When a mysterious figure gets his hands on the Book of Keys, whose secrets can cause the destruction of the world, A is the only one who can stop him. Her journey takes her through a world populated by zombie cops, machinegun toting imps, techno-wizards, closet trolls, demonic theme parks, other dimensions, Ultimate Darkness, and an undead ex-boyfriend.