The Doom of the Haunted Opera - The House With a Clock in Its Walls 6

When Lewis Barnavelt and Rose Rita Pottinger explore an abandoned theater, they discover an unpublished opera score. Ignoring a strange omen, they show it to their music teacher, who heralds "The Day of Doom" as a masterpiece. Then eerie Henry Vanderhelm, the composer's grandson, arrives--with a plan to awaken the dead and enslave the world!

John Bellairs