It is an ordinary Tuesday morning in April when bored, lonely Charlie Fisher witnesses something incredible. Right before his eyes, in a busy square in Marseille, a group of pickpockets pulls off an amazing robbery. Less alarmed than intrigued, Charlie defends one of their members, Amir, to the police, under one condition: he teach Charlie the tricks of the trade. In this novel for readers 9 to 12, Charlie enters the secret world of the whiz mob, an international band of child thieves who trained at the mysterious School of Seven Bells. But what at first seemed like a (relatively) harmless new pastime draws him into a dangerous adventure with global stakes greater than he could have ever imagined.