For a thousand years, Kaisi's people have kept the spellbinders chained to their will. Until those chains break...

Overnight, Kaisi's father is executed. Her brothers are bound into mindless puppets.

She is spared for one reason: her genius at the forge. The skills she was never meant to have.

Jule, the heir apparent of the rebellion, offers her a bargain: build an impossible device that will give Jule unrivaled power, and Kaisi's brothers go free.

It's all Kaisi ever wanted: her family safe and a legacy all her own.

Only Niall, the blacksmith who knows her better than anyone, understands what she's really being asked to build. Not just a device-a weapon to settle a centuries-old grudge.

Kaisi tells herself she can finish and still have it all. Her brothers. Her legacy. The boy who's becoming more than just a friend.

She doesn't look at what it would cost to be wrong..