13-year-old Gabriel is a brilliant pickpocket, a skill which he uses to keep his often empty belly not quite so empty. And then one day, he's caught. But instead of being arrested, he is invited by the mysterious Caspian Crook to attend Crookhaven - a school for thieves. At Crookhaven, students are trained in lock-picking, forgery and 'crim-nastics', all with the intention of doing good out in the world, by conning the bad and giving back to the innocent.