An evil wizard, a mysterious island, a dark tower, and a frightening monster are just some of the elements in this gripping new Lewis Barnavelt adventure. When Lewis, his uncle Jonathan, and their friends Rose Rita Pottinger and Mrs. Zimmermann vacation near Lake Superior, they encounter the ghastly Ishmael Izard, a sorcerer who's determined to destroy the world. Will they be strong enough to defeat him, or will their fate be decided by their formidable foe? Brad Strickland continues the best-selling series of the late John Bellairs in this hair-raising sequel to the immensely popular, critically acclaimed The House with a Clock in Its Walls.