Scooby-Doo! and the Opera Ogre is a children's book in the 8x8 series published by Scholastic.
When Scooby and the gang visit an opera house, they're afraid they will be bored to tears. But an ogre starts making trouble, and soon Scooby and Shaggy are scared to tears. Can Fred, Velma, and Daphne unmask the opera house ogre before it ropes their friends into the act?