Prisoners of Peace Series by Erin Bow

The world is at peace, said the Utterances. And really, if the odd princess has a hard day, is that too much to ask?Greta is a duchess and crown princess—and a hostage to peace. This is how the game is played: if you want to rule, you must give one of your children as a hostage. Go to war and your hostage dies.Greta will be free if she can survive until her eighteenth birthday. Until then she lives in the Precepture school with the daughters and sons of the world’s leaders... moreThe world is at peace, said the Utterances. And really, if the odd princess has a hard day, is that too much to ask?Greta is a duchess and crown princess—and a hostage to peace. This is how the game is played: if you want to rule, you must give one of your children as a hostage. Go to war and your hostage dies.Greta will be free if she can survive until her eighteenth birthday. Until then she lives in the Precepture school with the daughters and sons of the world’s leaders. Like them, she is taught to obey the machines that control their lives. Like them, she is prepared to die with dignity, if she must. But everything changes when a new hostage arrives. Elián is a boy who refuses to play by the rules, a boy who defies everything Greta has ever been taught. And he opens Greta’s eyes to the brutality of the system they live under—and to her own power.As Greta and Elián watch their nations tip closer to war, Greta becomes a target in a new kind of game. A game that will end up killing them both—unless she can find a way to break all the rules. less

Greta Stuart had always known her future: die young. She was her country's crown princess, and also its hostage, destined to be the first casualty in an inevitable war. But when the war came it broke all the rules, and Greta forged a different path. She is no longer princess. No longer hostage. No longer human. Greta Stuart has become an AI.If she can survive the transition, Greta will earn a place alongside Talis, the AI who rules the world... moreGreta Stuart had always known her future: die young. She was her country's crown princess, and also its hostage, destined to be the first casualty in an inevitable war. But when the war came it broke all the rules, and Greta forged a different path. She is no longer princess. No longer hostage. No longer human. Greta Stuart has become an AI.If she can survive the transition, Greta will earn a place alongside Talis, the AI who rules the world. Talis is a big believer in peace through superior firepower. But some problems are too personal to obliterate from orbit, and for those there are the Swan Riders: a small band of humans who serve the AIs as part army, part cult.Now two of the Swan Riders are escorting Talis and Greta across post-apocalyptic Saskatchewan. But Greta’s fate has stirred her nation into open rebellion, and the dry grassland may hide insurgents who want to rescue her – or see her killed. Including Elian, the boy she saved—the boy who wants to change the world, with a knife if necessary. Even the infinitely loyal Swan Riders may not be everything they seem. Greta’s fate—and the fate of her world—are balanced on the edge of a knife in this smart, sly, electrifying adventure. less