Melina and her friend Lisa cannot understand why they have developed magical powers - until they are whisked away from their homes in the middle of the night by the Gamlyns, a race of small, green people from another world and another time. The Gamlyns derive special powers from an extraordinary sapphire crystal hidden deep inside a cave. It seems that one of their race has learned to use its powers for her own wicked purposes, and her quest for power is threatening both the Gamlyns' world and our own. Melina and Lisa learn that they have a vital - and dangerous - part to play in helping the Gamlyns to save both worlds from destruction. An enthralling, magical fantasy story for 9-12 year olds.