Alex Reynolds is a part-time agent for the CIA.
A commercial artist by trade because he doesn't believe himself good enough for real art, Reynolds is living a very pleasant life with his husband, Peter, in Chicago. Of course, also living with him is his mother, a woman fairly well off and loving of her son, though not his chosen lifestyle. That is to say, Peter. Not that she has anything exactly against Peter except that he is male and since her son is also male, the chance for grandchildren seems slim.
To tell the truth, the townhouse in which they lived really belonged to Mom and it is a very nice one. Mom, a Brit by birth who came over to America to marry and stayed after the divorce years later because the weather was much nicer, has a considerable amount of money because her ex-husband had never bothered to change the beneficiary of his insurance before he got run over and apparently he was insured "up his bloomin' arse", according to Mom.
That is the life of Reynolds at the time the series starts. That was when, while waiting in a bar for Mom to watch an old movie in a local theater that bored Reynolds to death and Peter was working late, decided to have a drink or two to kill time. A very short, accidental, and innocent conversation with a stranger at the crowded bar was seen by two men pursuing the stranger. Now these men believe the stranger, an agent, passed something to Reynolds and that pushes Reynolds, Peter, and Mom into the clandestine work of the CIA and all the guns and knives and explosions that go with it.
Hardly trained for any of this and liking none of it, nevertheless, Reynolds holds his own against the enemy forces. With a lot of help from Peter. And even more from his mother.