Children Of The Sun (Book Three) by Adrian Meredith

Our heroes, Sarah and George, are facing the all-powerful Herald, who has conquered nine of the twelve kingdoms and declared himself High King, with enemies facing them at every turn. They are opposed by Mole People, Rhinokin, Swinekin, Berian Smokemen and dragons, with spies everywhere and uncertainty as to who they can trust. They aim to find the legendary Faerie Garden, the secret hiding place of the faeries, known as the Children of the Sun, but will the faeries be as welcoming as the children hope? Can our heroes convince the Faerie Garden to take them in, or will they be forced to live out the rest of their lives captured in prison, or worse? And what kind of world will exist if Herald is able to rule it unopposed?