The Shogun's Queen (The Shogun Quartet #1)

Only one woman can save her world from barbarian invasion but to do so will mean sacrificing everything she holds dear - love, loyalty and maybe life itself . . .
Japan, and the year is 1853. Growing up among the samurai of the Satsuma Clan, in Japan's deep south, the fiery, beautiful and headstrong Okatsu has - like all the clan's women - been encouraged to be bold, taught to wield the halberd, and to ride a horse.
But when she is just seventeen, four black ships appear. Bristling with cannon and manned by strangers who to the Japanese eyes are barbarians, their appearance threatens Japan’s very existence. And turns Okatsu’s world upside down.
Chosen by her feudal lord, she has been given a very special role to play. Given a new name - Princess Atsu - and a new destiny, she is the only one who can save the realm. Her journey takes her to Edo Castle, a place so secret that it cannot be marked on any map. There, sequestered in the Women’s Palace - home to three thousand women, and where only one man may enter: the shogun - she seems doomed to live out her days. But beneath the palace's immaculate facade, there are whispers of murders and ghosts. It is here that Atsu must complete her mission and discover one last secret - the secret of the man whose fate is irrevocably linked to hers: the shogun himself . . .