My 11 year old son had never really enjoyed a book since he outgrew Horrid Henry. He kept asking for George's Secret Key to the Universe, I think mainly because it has his name in the title. We were convinced he'd never get through it but finally caved in and bought it and he absolutely loved it. When we went to say good night to him he always had more exciting facts for us. We're now struggling to find another book he'll read as enthusiastically!