Rulebreaker by Cathy Pegau

Liv Braxton's Felon Rule #1: Don't get emotionally involved. Smash-and-grab thieving doesn't lend itself to getting chummy with the victims, and Liv hasn't met anyone on the mining colony of Nevarro worth knowing, anyway. So it's easy to follow her Rules. Until her ex, Tonio, shows up with an invitation to join him on the job of a lifetime. Until Zia Talbot, the woman she's supposed to deceive, turns Liv's expectations upside down in a way no woman ever has. Until corporate secrets turn deadly. But to make things work with Zia, Liv has to do more than break her Rules, and the stakes are higher than just a broken heart… 89,000 words