Pilfer Academy: A School So Bad It's Criminal by Lauren Magaziner
George has never heard of Pilfer Academy, a top-secret school for training young thieves, until he's kidnapped as its newest student. The teachers are kooky at best, and "naughty" does not even begin to cover his sneaky, smart, and morally bankrupt new classmates. Between disguise classes, cracking safes, and DIY gadgets, George becomes an expert bandit and finds true friendship with Tabitha, his new partner-in-crime. But when George is forced to steal something from a child, he's faced with an awful truth: He can't do it. Despite his talents, George is just too good to be a thief. But finders keepers losers weepers at Pilfer Academy, because not thieving is not an option, and "misbehaving" students face Dean Deanbugle's favourite punishment...the Whirlyblerg! In order to gain their freedom, George and Tabitha must pull the biggest heist the school has ever seen and reveal their true colours not as thieves, but as kind-hearted (and, okay, mischievous) kids.