The Thief's Apprentice: Master Diplexito and Mr. Scant (Book 1)

Oliver, the meek son of a wealthy British industrialist, discovers the identity of a notorious thief, a man who has been skillfully evading Scotland Yard and snatching priceless artifacts for sport: Mr. Scant, his family butler. After first fearing for his life, Oliver discovers Mr. Scant's secret within a secret: the butler's crimes are actually a series of strikes against an underground group of business tycoons trying to master black magic.