The Daughters of Nightsong. V. J. Banis

Trapped in a loveless marriage, April Nightsong longs for the China she once knew as a child, and for her forbidden lover, David McNair. When the lovers find themselves together in Paris, they set out together for China, unaware of the half-sister that awaits April there–or the evil that threatens to destroy the two lovers. Meanwhile, back in the United States, despite a surface existence of power and wealth, Lydia Nightsong, April's mother, suffers anguish and terror at the never-ending threats to her cosmetics empire and her life. The only man who can save her is her sworn enemy, the one she has vowed to avenge–the one she hopelessly loves with a love they once lost in the shadow of a nightsong. Book Two in the Nightsong Saga–a dynasty driven by lust and passion, a daughter forever marked by her mother's sin. Great historical romance by a master storyteller!