After witnessing a troupe of pickpockets pull off an incredible robbery in a busy Marseille square, Charlie Fisher agrees to protect one of the thieves if they teach him their ways, leading him into a world of adventure with global stakes.

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. As the young bandits appear to melt into the crowd, Charlie realizes with a start that he himself was one of their marks. Yet Charlie is less alarmed than intrigued. This is the most thrilling thing that's happened to him since he came to France with his father. So instead of reporting the thieves, Charlie defends one of their cannons, Amir, to the police, under one condition: he teach Charlie the tricks of the trade. What starts off as a lesson on pinches, kicks, and chumps soon turns into an invitation for Charlie to join the secret world of the whiz mob, an international band of child thieves who trained at the mysterious School of Seven Bells.