The people of Uztar have long looked to the sky with hope and wonder. Nothing in their world is more revered than the birds of prey and no one more honored than the falconers who call them to their fists. Brysen strives to be a great falconer-while his twin sister, Kylee, rejects her ancient gifts for the sport and wishes to be free of falconry. She's nearly made it out, too, but a war is rolling toward their home in the Six Villages, and no bird...

Kamzin has always dreamed of becoming one of the Emperor's royal explorers, the elite climbers tasked with mapping the wintry, mountainous Empire and spying on its enemies. She knows she could be the best in the world, if only someone would give her a chance. But everything changes when the mysterious and eccentric River Shara, the greatest explorer ever known, arrives in her village and demands to hire Kamzin-not her older sister Lusha, as everyone...