Injustice by K. A. Kron; Brenda L. Leffler

The Mile-High City has its troubles. Fortunately it also has a troubleshooter, Riley Connors, who is more than what she seems: law student, waitress, and flirt. Because Riley has a past and connections that enable her to protect the people around her. She's a nemesis to many. Her penchant for investigating and meting out justice to criminals and scum that the law has not touched is about to be tested when Riley meets Ali Garcia, a girl who presses every one of Riley's buttons, from caution to distrust to desire. Ali's in danger and Riley finds herself unable to resist, knowing full well that even her wiles and skills at handing out justice are about to be tested.