Following the life-altering events at the conclusion of The Unwanteds, the stark world of Quill and the magical haven of Artimé are now home to whoever wants to live there, whether they are Wanteds, Unwanteds, or Necessaries. In Artimé, Alex Stowe and his friends continue to hone their artistic magical spells while welcoming newcomers, wondering how long this peace between Quill and Artimé will last. Alex is stunned when Mr. Today comes to him with a very special request—one Alex questions his readiness for, until circumstances offer a dramatic answer. And back in Quill, Aaron Stowe, Alex's twin, faces a very different path. Devastated by his loss of status after Justine's defeat and seething with rage toward Alex, Aaron is stealthily planning his revenge and return to power. Alex and Aaron's separate stories proceed with suspenseful pacing, colliding in a stunning climax that elevates sibling rivalry to epic proportions and leaves the fate of both worlds hanging in the balance.