Derek Landy 
Skulduggery Pleasant 

Meet Skulduggery Pleasant Ace Detective Snappy Dresser Razortongued Wit Crackerjack Sorcererand Walking, Talking, Fire-throwing Skeletonas well as ally, protector, and mentor of Stephanie Edgley, a very unusual and darkly talented twelve-year-old. These two alone must defeat an all-consuming ancient evil.The end of the world? Over his dead body.