The Gemstone Chronicles Book Four: The Ruby

The Dark Elves are on the march, the barrier between the magical world of Celahir and the human world has almost vanished, and the Spider Queen is consolidating her power. Despite the fact that three of the four stolen Elven Bow gemstones have been recovered, the Light Elves are fighting a losing battle in Celahir.

Nana, Beebop, Aidan, and Maggie are ignorant of these developments as Christmas break begins. However, they start seeing ravens everywhere, a dragon lands on the roof and then chases them down the road, and they are about to be incinerated when the Elven Scout Alatariel and his sisters rescue them. Escaping on the backs of the legendary Arien - giant falcons that awakened to defend Celahir - they fly off to Celahir.

Things get even worse when they arrive in Celahir and have to recover the final gemstone - the Ruby - from the clutches of a lava monster, save Maggie from the evil elves Enelya and Elerosse, and restore the gemstones to the Elven Bow!