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.

Ten years after Alex and Aaron Stowe brought peace to Quill and Artimé, Alex and his Unwanteds set out to rescue his sister, Thisbe, from dragon land leaving her twin, Fifer, behind.

Devastated by loss and hampered by war, Fifer struggles to regroup and continue the search for her twin. Meanwhile Thisbe, pounded by images of Grimere's dark history, contemplates her abandonment and considers leaving Rohan behind in a risky move that could take her home... or to her death.