Finding the required book did not take long. The Mouse Army split itself 
up into small detachments, each of which wrestled a different book from the 
shelf, opened it up on the floor, and scampered through it one page at a time, 
looking for relevant spells. Within the hour, Princess Nell noted that a broad 
open corridor had developed in the Mouse Army, and that a book was making its 
way toward her, seeming to float an inch above the floor.