Reveal hidden images throughout Hogwarts and the wizarding world in this official Harry Potter activity book!Harry Potter, Ron Weasley, Hermione Granger, and the rest of their friends at Hogwarts are always casting spells and brewing potions to reveal -- and hide -- secrets in the wizarding world. Now you can do the same with the help of three pairs of magic-revealing glasses in this fun, interactive activity book!Put on Harry’s glasses to see who's hiding under his Invi