The Topaz Quest — Gill Vickery

Tia is determined to retrieve the DragonQueen's six stolen Jewels of Power from the High Witches. She has the emerald that lets her speak to animals and the opal that lets her change shape. Now she goes after the weather-altering magical topaz. But the High Witches have realized that they are under attack, and the High Witch Luona, in her icebound fastness, will not let the topaz go without a fight. Can Tia and her DragonBrother Finn continue their quest now the powerful witches are on the alert?