Mitch and Polly McKenna are part-time agents with the CIA.
Well, Polly is a former agent with that organization though when we meet this married couple, Mitch has not idea of her previous employment. I did not see what she might have told him she did back when they first met but since Mitch never asks any more about the matter, it must have been both prosaic and reasonable.
Mitch McKenna, we learn right off, was a Marine pilot and loved it up to the time when a flight went wrong and his best friend died and Mitch quit the Marines in grief. As we are introduced to them, they are quietly and not too successfully dealing with the issue and slowly pulling apart. Mitch's current line of work as an airline pilot and the frequent time away from home is definitely not helping in that matter.
That will change once both are given something intriguing to get their minds off their trouble and slowly repair their relationship - all while trying to solve a murder mystery and, as it turns out, not getting themselves killed in the process. Oh, and then there is the little matter of the CIA coming back into the picture.
Mitch will, as the series progresses, decide to take the same training that his wife did years before they met and learn the ropes at Camp Peary same as she. This will bring them back close again and make them a pretty impressive team, one the Agency will find a good deal of use for.
- Mitch opines regarding the symbiosis of reminiscing and Scotch, "Indulgence in one usually leads to indulgence in the other."