Lorraine Broughton and David Perceval are agents with MI6.
This is an unusual series. There are two major events being depicted, separated by almost a decade.
The first adventure deals with a mission by Broughton. The activities take place in Berlin and that is Perceval's patch. It is a place that if Broughton had ever been, it was not on a mission and not a place she felt happy to work in since she did not speak much German.
The second adventure takes place eight years before and deals with a mission that Perceval, a man who is about to be returned home because of repeated foul-ups, is given one final job before departure. Broughton is not involved in any way, not even a mention.
In that regard, the series should rightly be that of Perceval but Broughton is the main force in that first story and without her participation in it, we would have hardly any reason to look at Perceval twice.
Broughton is a very experienced operative in other parts of Europe, especially Finland, and she speaks Russian like a native. She is highly self-confident and self-sufficient and it is obvious that she prefers to work alone. Certainly she does not have any interest in kowtowing to anyone. She appears to be in her late 30s or early 40s, dresses conservatively and is not a big talker. She is particularly adept at keeping her emotions and her thoughts to herself.
Perceval is, in that first adventure, the MI6 station chief and he has been in that city for quite a few years, knows it and its covert players very well, and is not happy to have someone else brought in over him. He is likely a decade older than Broughton, gradually losing his hair while maintaining a busy mustache. He is not at all reticent about letting his feelings known.
They do not know each other when we meet them and they have no desire to work together.