How far would you go to teach someone a lesson? It was a romantic weekend, one Kahra Daniels hadn't experienced in a long time. But, when Kahra discovers that not only is the man she's seeing married, but living happily as a family with children in New York, things take a turn for the worst. Stripped of her pride and ordered to be taken away by the very man she thought she could love, a new, dark door opens within her. "This isn't over," she promises before being thrown into a cell for 30 days. It is during her lonely nights there that she develops a plan to assassinate anyone he's last seen with. Her logic is simple: once the bodies begin piling up, the cops will turn to him after realizing he's the only common denominator. Fueled by her own traumatic past and sometimes unstoppable flashbacks, Kahra soon puts her plan into action, and as the body count rises, so do the stakes.