"Arnold answers the phones at Superhero HG, where his whole family use their amazing superpowers to help nab the bad guys. Arnold's powers on the other hand, haven't shown up ... yet. But one day, the phone rings with an urgent request for help and all the superheroes are off superhero-ing, so it's up to Arnold to save the day! There's just one problem: how can he save the day without any superpowers?"-- Provided by publisher.