Mac gets an alert on her Library Hotline that a Bookworm has invaded the
Mouseum Library, which holds the precious Book of Lost Treasures. They rush to try and find the Bookworm. Mac, who is an avid reader, is determined that the Bookworm will destroy every book in the Library. The chase is on, until the Bookworm is cornered in a glass Reading Room, which holds the Book of Lost Treasures. Then they learn what empathetic Mo has suspected all along –the Bookworm only wants to READ books. He’s been judged solely on his scary appearance. Mac learns that you truly can’t judge a book by its cover.