The lock on the Book of the Book yielded to the same key that Princess 
Nell had taken from King Coyote. She had discovered this very early in her 
exploration of the library but was unable to comprehend the contents of this 
volume until she had studied the others and learnt the secrets of these 
machines. The Book of the Book contained a complete set of plans for a magical 
book that would tell stories to a young person, tailoring them for the child's 
needs and interests—even teaching them how to read if need be. It was a 
fearsomely complicated work, and Princess Nell only skimmed it at first, 
recognizing that to understand the particulars might take years of study.