Alex and his friends from Artimé are stranded on a newly-discovered island, and they are not alone, while in Quill, his twin Aaron's power base grows as he joins with an unlikely ally in a risky plan to finally conquer Artimé.

As the Wanteds, Unwanteds, and Necessaries struggle to adjust to changes in their society, Mr. Today begins training fourteen-year-old Alex to replace him as Artimé's leader one day while Alex's disgraced twin, Aaron, connives to take over Quill.

As the greatest army ever assembled in the seven islands flies to the land of the dragons, everyone's mind is haunted by the same thought: Thisbe Stowe betrayed them all. Thisbe struggles to regain the trust of her brother Aaron and the people of Artimé after one crucial mistake forces her to abandon her intricate plan against the Revinir. Aaron is devastated by Thisbe's actions and refuses to hear her explanation, feeling a sense of responsibility...

Five children who are the offspring of supernatural criminals and who have special abilities of their own leave their isolated tropical home and head to the city of Estero, where they hope to find their parents and the treasure they hid years ago.