The epic conclusion to the brand new York Times bestselling Change series set in a turbulent, post-apocalyptic world, in which human beings have rebuilt society following the collapse of advanced technology. Two decades after the Modification, Crown Princess Orlaith problems to protect the hard-won serenity her father taken to Montival-the previous western USA. But the Change opened many doorways, and through them capabilities strong and strange and horrible walk once again among humankind. With her fire-forged friend and ally, Japanese Empress Reiko, Orlaith must consider up her sword to stop the spread of the mad malignancy behind the Yellow Raja that has imprisoned her sibling Prince John. And through the rising superpower of Mongolia, the Sky-Blue Wolves of the High Steppe ride once more under the banners of Genghis Khan-the thunder of their hooves resounding across a world in turmoil.