In Mighty Meg book 4, Meg pulls a page from comic book superheroes by trying to create her very own superhero disguise! Can she find the perfect costume so she can save her classmates without revealing her true identity? After almost having her superpowers discovered while rescuing a toddler from a sinkhole, Meg decides that she needs a disguise so she can help people while protecting her identity. But when more sinkholes start appearing out of nowhere, Meg may have to put aside her costume dilemma and risk being recognized in order to save the day! Can Meg find the perfect disguise and still get there in the nick of time?