Eva Delacourt is an agent with the Section.
The Section is a small arm in the British Intelligence community and considering the lethality that its agents show when threatened, it is not a simple fact-finding organization.
Delacourt has been an operative in very good standing for some time but three years before the adventure depicted in three volumes takes place, she dropped out and went into officially sanctioned hiding. Since then she has moved every six months or so to a different country, staying in British ex-pat communities to not stand out too much, all to avoid the hit squads that were hunting her.
Prior to her going on the run, she had been assigned as a "close protection officer" to what was described as an information courier who was acting as a conduit for the Brits, the Yanks, and other interested parties. It was not just the man, Doug, she was guarding, though. There was Doug's young son. As can happen, Delacourt and her protectee fell in love and were going to be married. Then, despite her excellent skills, he was assassinated and she and the boy were also known to be targets.
When a subordinate comments that the trouble which appeared at Delacourt's door that morning must have been because she had made a mistake, his superior countered that "Eva Delacourt doesn't make mistakes". His opinion is borne out by the fact that when a team of six trained bad guys went after her, she alone walked away.
Now that the danger they were trying to avoid has come at both of them full bore, Delacourt has decided to take the fight to them and, like the man said, she doesn't make mistakes. Oh, one little fact I didn't mention. Before she decided to take a break and work on the protection side of things, Delacourt was the Section's best assassin so when it comes to action, she knows a thing or three.