The story, first published in 2007, follows 'Skulduggery Pleasant', an undead wizard and detective, with his partner 'Stephanie Edgley' (aka 'Valkyrie Cain') and numerous magic-wielding allies as they try to prevent 'Nefarian Serpine' from unleashing a weapon of terrible power on the world.
The book was retitled "Sceptre Of The Ancients" for the 2009 paperback release in the US and Canada.