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Greta is a Duchess and a Crown Princess. She is also a Child of Peace, a hostage held by the de facto ruler of the world, the great Artificial Intelligence, Talis. This is how the game is played: if you want to rule, you must give one of your children as a hostage. Start a war and your hostage dies.

The system has worked for centuries. Parents don't want to see their children murdered.

Greta will be free if she can make it to her eighteenth birthday. Until then she is prepared to die with dignity, if necessary. But everything changes when Elian arrives at the Precepture. He's a hostage from a new American alliance, and he defies the machines that control every part of their lives--and is severely punished for it. His rebellion opens Greta's eyes to the brutality of the rules they live under, and to the subtle resistance of her companions. And Greta discovers her own quiet power.

Then Elian's country declares war on Greta's and invades the prefecture, taking the hostages hostage. Now the great Talis is furious, and coming himself to deliver punishment. Which surely means that Greta and Elian will be killed...unless Greta can think of a way to break all the rules.

Greta Stuart has become AI. New transmitters have silvered her fingerprints. New receptors have transformed her vision. And the whole of her memory has become one book in a vast library of instant knowledge. Greta is ready to rule the world.

But the new technology is also killing her.

Greta is only sixteen years old, but her new enhancements are burning through her mortal body at an alarming rate. Of course the leader of the AIs, an ancient and compelling artificial intelligence named Talis, has a plan. Greta can simply do what he's done when the time comes, and take over the body of one of the Swan Riders, the utterly loyal humans who serve the AIs as part army, part cult.

First though, Greta will have to find a way to stay sane inside her new self. Talis's plan for that involves a road trip. Escorted by Swan Riders, Greta and Talis set out on a horseback journey across the strange and not-quite-deserted landscape of Saskatchewan. But there are other people interested in Greta, people who want to change the world...and the Swan Riders might not be as loyal as they appear...