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For too long, Violet and the people of the outer circles of the Lone City have lived a life of servitude, controlled and manipulated by the royalty of the Jewel. But now, the secret society known as the Black Key is preparing to seize power and knock down the walls dividing each circle.

And while Violet knows she is at the center of this rebellion, she has a more personal stake in it--for her sister, Hazel, has been taken by the Duchess of the Lake. Now, after fighting so hard to escape the Jewel, Violet must do everything in her power to return, to save not only Hazel, but the future of the Lone City.

In this thrilling conclusion to Amy Ewing's epic trilogy, Violet's loyalty to her family is pitted against her dedication to overthrowing a destructive and terrifying regime. This is an explosively compelling story that readers won't be able to put down.