Legendary ATF agent Quint Casey isn't thrilled to pose as Ree Sheppard's husband for a covert investigation into a weapons ring that could be tied to his past. Feeling guilty over a tragic event, Quint’s determined to do whatever it takes to make things right. But when his impetuous "wife" proves her commitment to the job, Quint feels a spark just as alarming as the dangerous killers he’s sworn to unmask.