Whisperwren, Wizard’s Ring
This is the third book in the Whisperwren trilogy. Bob and Sally embark on an adventure in the dream world, learning to use the wizard’s ring. Later on, Daniel is reunited with Whisperwren, and he inadvertently causes the forces of the hidden realm to be unleashed on Earth. Only Daniel, Bob and Sally can save the world, but first they must prove that they are true champions.