Tormented after a daring escape, Cora Sandoval must find a way to stop the Arrazi from murdering innocent people and from violating, using, and killing the Scintilla for their powers. She must also accept one bitter betrayal: Finn Doyle—the Irish boy who has both a piece of Cora's heart and soul—is Arrazi...

On the verge of extinction and sought by those who would either consume or destroy them, Cora and the remaining Scintilla survivors must solve the mystery of The Light Key. If they fail, the truth will stay buried forever and mankind will pay the ultimate price.

No longer will she hide.

No longer will her loved ones be hunted.

And she will have her vengeance...even if she shatters her heart in the process.