They Do Not Falter by C.C. Rock

Vasily Reese escaped the crime life she was born into when she put one of the most powerful and dangerous gang leaders in prison. Her father. For murdering her mother in cold blood.
Two years later, after building herself a life from the ground up, she is yanked back into the underbelly of her beloved city when someone makes an attempt on her life.
She nearly died. Nearly. She had a guardian angel that night. No, not an angel. A dark knight.
For her rescuer was none other than Rennick Stone. The head of the most notorious crime family and a king of Luxton.
It took only one look at the woman he saved for Rennick Stone to know he wanted her, to protect her, to have her as his queen.
And Rennick Stone takes what he wants.