Miss Green gives the kids an assignment: they’ll spend the day with an adult to discover their job. Matilda, of course, jumps at the chance to work with Grandpa, while Jim is excited to be with the bobby. “Police work must be thrilling, right? Like an adventure!” But Grandpa is not pleased at all to have an intern (and no you won’t set foot on the ship, young lady!), and Jim soon finds out that the bobby has… very quiet days. While Matilda tries to overcome every traps Grandpa sets for her, Jim tries to find every occasion to make his missions exciting. It all ends up with Matilda trying to “borrow” an old pirate relic from the museum, and Jim having to apprehend her in the name of the law. How are the kids going to get out of that one, while not ruining their finale presentation to Miss G.?