The Golden Princess: A Novel of the Change (Emberverse Book 11)

A new generation faces its own challenges in the world the Change has made.

Princess Órlaith, heir to Rudi Mackenzie, Artos the First, High King of Montival, now wields the Sword of the Lady—and faces a new enemy. Fortunately, she also has a new ally in Reiko, Empress of Japan, who has been pursued to America by a conquering army from Asia.
 
To combat their mutual foe, Órlaith and Reiko embark on a quest to find the fabled Kusanagi-no-Tsurugi, the Grass-Cutting Sword, one of the three great treasures of the Japanese Imperial House. But dreams have revealed that the road to Kusanagi lies through the meganecropolis of the City of Angels, the greatest and most perilous of the dead cities...and beyond it, to a castle in the fearful Valley of Death. And their relentless enemy will stop at nothing to prevent them from succeeding.
 
For across the Pacific, the great arc of land that stretches from the dark kingdom of Korea to the realm of Capricornia in Australia is threatened by war. Now all the survivors of the Change must choose sides....