Ответ:

  1. Lucy and Ben are in a castle.
  2. They find the book in a secret room.
  3. Horax and Zelda can see them.
  4. They take the book away from the children.
  5. Lucy has got an idea.
  6. The children get the book back.
  7. Buster helps the children and stops Horax and Zelda.