Search of the Rainbow Power

I have written a fantasy about a pair of elves setting out to carry on their parent’s work of making the best wands in the country. They have to travel far and wide to collect the ingredients for their wands. They seek opals for its rainbow colour, silver to give it strength, and water from the blue lake to mix with their own hidden spring water to activate its magic. Their two children travelled with them and like children everywhere, they are forever getting into difficulty. On one occasion they disappear into a painting and find they have to answer a riddle to escape. It was a trap set by the wizards. Later they are captured by Goblins and have to be rescued by a wombat who is a friend of the family. In their absence, an evil wizard comes to reside across from their farm where he attempts to learn the secret of their hidden spring. He is closely watched by small animals and birds who are friends of the elves. But being so small they can only watch as he discovers the whereabouts of the spring and sets a trap for the elves on their return. I feel this novel would suit children aged nine to twelve.