Skulduggery Pleasant: the dying of the light. Derek Landy. 2014.

Following the loss of Valkyrie Cain, Skulduggery Pleasant draws together a team of soldiers, monster hunters, killers and criminals to track down and stop Darquesse before she turns the world into a charred, lifeless cinder.

The war of the Sanctuaries may be over, but the final battle is about to begin. And not everyone gets out of here alive……