There are 2 books in the Empress Orchid series. The newest book is The Last Empress which came out in 2007.

1
Empress Orchid

Book cover of Empress Orchid
To rescue her family from poverty and avoid marrying her slope-shouldered cousin, seventeen-year-old Orchid competes to be one of the Emperor's wives. When she is chosen as a lower-ranking concubine she enters the erotically charged and ritualised Forbidden City. But beneath its immaculate facade lie whispers of murders and ghosts,…
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2
The Last Empress

The Last Empress
At the end of the nineteenth century China is rocked by foreign attacks and local rebellions. The only constant is the power wielded by one woman, Tzu Hsi, also known as Empress Orchid, who must face the perilous condition of her empire and devastating personal losses. In this sequel to…