Harper Sharp is like most fifth graders. He's juggling homework friendships video games and...oh yeah he's busy solving major mysteries! When Starview Elementary announces their annual Young Inventor's Fair everyone's minds start whirring. What will they make? A new trading card game? Collectible slugs? Suddenly ominous fliers appear all over school warning kids and teachers to BEWARE THE FAIR! Can Harper figure out who's behind this terrifying threat and foil their nefarious plans? Or will these young inventors' sparks be extinguished forever?! Suitable for primary schools and libraries. Will appeal to fans of Detective Beans. Pages - 304.