I don't want to say anything about this yet so that others can experience the magic of reading it with no clues, either. Just read it and be amazed. (Special thanks to Evan for getting me the ARC from ALA!) 
 Update upon getting the final copy: I loooove the gold-edged pages! Booktalk note: show what's in the basket & the note (first section)... 
 Favorite quotes: (view spoiler)[ 
 "Sometimes a strange feeling would come over them as they'd race through the pages, and the words would dissolve, and they find themselves deep inside Oz, or Narnia, or the Andes, or Africa, where everything was real and vivid and alive." (405) 
 "Start by forgiving your uncle for his anger. That would be a nice gift." (490) 
 "'And since the men who built the early theatres were mostly sailors who had returned from the sea...Billy felt right at home.' Joseph remembered how the backstage of the Royal Theater, with its miles of ropes and rigging, made him think of a ship." (507) 
 "'That's why words common in the theatre now, like 'crew,' 'deck,' and 'rigging,' all come from the sea.'" (549) (hide spoiler)]