Witch and Wizard, Volume 2: Operation Zero — James Patterson

Whit and Wisty get the shock of their lives when a member of the New Order's inner circle, The One Who Bans Books, contacts them with a clandestine proposal: he wants their help in removing The One Who Is The One from power! He confesses to having grown disgusted with the N.O., and reveals that he's aware of an ancient book of the occult that holds a spell for stripping an individual of all their magic. Unfortunately, the book is in a heavily-guarded N.O. bunker that's shielded against magic portals from Shadowland. But more importantly, can the Allgood siblings even trust this man who is willing to commit treason, or is his offer just an elaborate trap?