The Dark Tree

Edward asks the Tall Knight for his help, but he says he can't help unless Tracey and Towser are there, because the old legend involves a boy, a girl, and a dog, and he vanishes. Luckily, Tracey and Towser are still hanging around, and they meet up with Edward after Towser drags her to the folly. The Tall Knight appears again, and instructs them to "go to the old library, and a gold key you will see, inside the inside of the Dark tree". While trying to crack the Tall Knight's riddle, Edward realizes that he meant the Dark Family Tree, and they find the final clue, which falls out of the spine of the book. The clue reads: "The knight's treasure will rest inside the inside of a studded chest".