The B.T. and Jimmy Adventure Series continues with Book 3, "The Mystery of the Haunted Opera House." Follow the teen detectives and their friends Patti and Sandy as they venture into the realm of ghosts and strange happenings at the world-famous Haskell Opera House and Library. Situated on the international border between Vermont and Canada, the Haskell has long been rumored to be haunted. When the Paranormal Investigators of New England show up to investigate, B.T. and his friends tag along to check things out. That