Harry Connolly is an agent with the CIA.
Ewan Ramsay is not, though he certainly gets involved in the same type of work as Connolly.
This is because Ramsay is Connolly; or at least will be. Connolly will, in the course of his activities, find it prudent to disappear and when he does, Ramsay shows up some time later in Ireland. Of course, since Ramsay and Connolly are the same person, "both" are quite capable of taking care of themselves when the going gets rough.
And when that going is up against Russia and highly experience former KGB agents, having the intelligence and experience that Connolly/Ramsay possesses is vital. Connolly is not interested in playing the "Great Game" any more, having a wife to come home to is far better than any reward he might get. Unfortunately for him, that wife is also the bait that will be used to keep him playing.
Time will pass in this series and we get to see Connolly grow older but luckily for us and for him, he still keeps his wits about him and puts proof to the adage that "once a spook, always a spook". It also shows that no matter how well one hides, and Connolly is an expert at such things, people with the know-how can and do track one down when it is in their interests. With Connolly, when he is given the carrot-and-stick type offers, the carrot is not that fresh and the stick had thorn in it.
Back for a moment on the 'wife as bait' matter. The wife in this series is Sasha, an Israeli former Kidon assassin so it is interesting to watch when people use threats against her as motivation for Connolly to help them. Sasha is no delicate flower. Threatening her seems a very foolish thing to do.