The Unwanteds quests

Magical twins Fifer and Thisbe Stowe have spent their entire lives wishing for an adventure when a dragon shows up claiming that his family is being kept as slaves in their homeland, the twins sneak off to the land of the dragons to help them.

Trapped underground in the catacombs and made to transport the bones of ancient dragon rulers to the extracting room, where others extract the magical properties dormant in the bones, twin Thisbe must learn how to control her own fiery magic and use it to escape.

"Magical twins Fifer and Thisbe Stowe have spent their entire lives wishing for an adventure. When a dragon shows up claiming that his family is being kept as slaves in their homeland, the twins sneak off to the land of the dragons to help them"--.