Last Concubine. The Shogun Quartet, Book 2, Paperback/Lesley Downer

Sachi, a beautiful fifteen-year-old girl, is chosen to be his concubine.But Japan is changing, and as civil war erupts, Sachi flees for her life. Before she dare dream of a life with him, Sachi must uncover the secret of her own origins - a secret that encompasses a wrong so terrible that it threatens to destroy her ....