The Dying of the Light - Derek Landy

He’s dead. She’s deadly. The bad guys don’t stand a chance. The ninth book in the bestselling Skulduggery Pleasant series. Following the loss of Valkyrie Cain, Skulduggery Pleasant must track down Darquesse before she turns the world into a charred, lifeless cinder – and so he draws together a team of soldiers, monster hunters, criminals and Valkyrie’s now murderous reflection.Not everyone gets out of this alive.‘A thoroughly satisfying blend of humour, magic and adventure’ Rick Riordan, author of the Percy Jackson series