The Gemstone Chronicles Book One: The Carnelian
by William L Stuart
When Aidan and Maggie find a fairy cross while rock-hunting with their grandfather, it's just an oddity. But when they discover there is an elf imprisoned in the stone and set him free, they and their grandparents, Nana and Beebop, are attacked by Dark Elves and forced to flee to the magical world of Celahir.
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