"It's the fourth Skulduggery Pleasant adventure! only Skulduggery Pleasant himself is lost on the other side of a portal, with only some evil gods for company. Can he possibly survive? (Yes, all right, he's already dead. But still.)"--Provided by publisher.

Skulduggery Pleasant and Valkyrie Cain are back - just in time to see their whole world get turned upside down. With Valkyrie struggling to protect her dark secret, Skulduggery and the gang are more vulnerable than ever, just as a plague of body-snatching Remnants are released upon the world...

War has finally come. But it's not a war between good and evil, or light and dark - it's a war between Sanctuaries. For too long, the Irish Sanctuary has teetered on the brink of world-ending disaster, and the other Sanctuaries around the world have had enough. Allies turn to enemies, friends turn to foes, and Skulduggery and Valkyrie must team up with the rest of the Dead Men if they're going to have any chance at all of maintaining the balance of...