Doom of the Haunted Opera - The House With a Clock in Its Walls 6, Paperback/John Bellairs

When Lewis and Rose Rita explore an abandoned theater, they discover an unpublished opera score entitled 'The Day of Doom'. Little do they know that the eerie Henry Vanderhelm, the composer's grandson, arrives with a plan to awaken the dead and enslave the world!Soon, all the adults are enamoured - and enspelled - by Henry Vanderhelm.