Barbara Cartland 
The Dragon and the Pearl [EPUB ebook] 

An astonishing tale of grand passion, intrigue and espionage in the heart of turn-of-20thcentury China – a simmering cauldron of hatred and resentment of foreigners that rises to the boil as the notorious Boxer rebels burn Christians and their Churches.
Intrepid adventurer and acknowledged expert in Far Eastern affairs Major Stanton Ware puts his life on the line in a perilous undercover mission for his Prime Minister.
But it is not fear that takes his breath away and steals his heart, it is his very first glimpse of Zivana, the young part-English, part-Russian, part-Manchu stunning beauty who is to be his mission partner!