Daughter of the Demimonde (The Demimonde Trilogy #1)

It is 1910, and the city of Butte, Montana is on its way to becoming one of the wealthiest cities of America. The success of the silver and copper mines has drawn a number of young men in search of fortune and glory. Not surprising, a number of women followed these men in search of their own fortune, and thus the Demimonde was formed.
Cathleen Ainsley grew up admiring the strength and independence of her mother, a powerful madam in the red light district of Butte. And when the newly formed Bureau of Investigation sends the irresistible Kane Malone to Mercury Street to investigate allegations of human trafficking in the parlor houses, Cat is eager to prove her mother's honest heroism. His charm and conviction capture her heart, and she agrees to assist with the investigation. It is her close and personal look at the underbelly of the red light district that causes her to question everything she thought she knew about herself and her mother. And in an effort to protect her mother's innocence, she may end up sacrificing her own.