After an attack that left her both physically and emotionally scarred, Tucson prosecutor Mackenzie Wilson is ready to get back to work. Reassigned from prosecuting to public relations, Mack is trying to make the best of her new situation. And though she's back together with her ex-girlfriend, Dr. Anna Lapin, their reignited relationship has already begun to fray.

When the body of a young woman is found with Mack's business card in her pocket, Mack becomes an obvious suspect. When support from Anna wavers and Mack is put on administrative leave, Mack begins to spiral. And then another body is found.

Battling to protect her reputation and her job, Mack turns to her best friend Jess Lafayette. Together, they find themselves doing the only thing that they can—investigating the murders before time runs out for them and for Anna.