The Madam's Lover. Assassin's Core, #1

Tatiana is a buyer for a high-end boutique and a lesbian partially in the closet. On a dark road on a stormy night, fate throws her into the arms of Alexi Russo. After a night of passion, Tatiana's dragged from the closet and thrown head first into a world of money laundering, hits, brothels, and a secret that threatens to destroy her entire family. Alexi's a jaguar shifter, and an assassin whose business is women.
She's been searching for a woman strong enough to walk at her side, and she's certain Tatiana Rayne is that woman. However, Tatiana's grandfather, a new under-boss for the mob, is determined to bring Alexi to heel. Alexi refuses to play dead for anyone, putting Tatiana in a tough position. So, when the chips fall, Tatiana will have a choice to make-run or walk into the fires of love.