To the world, she is a source for magic.

To him, she is the one thing he cannot have—and cannot live without ...

Briony Rosewood escaped the worst of it—or so she tells herself. Being forced to serve the woman who betrayed her family and gutted the Evermore kingdom is the closest thing to safety she could ask for. But even the protection of the powerful Hearst family has limits, and now Briony must do the unthinkable: share her magic—and her heartbeat—with Toven Hearst. Once her enemy … now her tentative ally.

Forced to travel to distant courts and glittering foreign kingdoms, Briony plays the part of Toven’s adoring heartspring, smiling for the enemy while secretly feeding the rebellion. Every whispered confidence, every stolen moment, becomes a weapon as she gathers information and forges dangerous new alliances. It’s devastating to pretend she’s in love with the man whose family helped destroy her own. But the cruelest part is that her treacherous heart has always been his.

But the Hearsts harbor secrets of their own—and none is darker than Toven’s shadowy, devastating gift. For any of them to survive, Briony must learn what Toven can do … and what he can undo.

Because when the lost daughter of Evermore finally chooses where her heart belongs, everyone will come to know the full force of their combined power—and her wrath.