Gone Tomorrow by Lee Child.
I really enjoy his books for some odd reason. Jack Reacher is a former MP, retired, and he just drifts around the country with a toothbrush and an ATM card and solves crimes and saves people along the way. I don't know how accurate they are because I've never killed anyone with my bare hands, but they seem well researched and at least semi-factual.
This story is about a woman who worked for the Pentagon, who was blackmailed into turning over a file to a mystery person. I don't want to give away too much of the story, but it does relate to what's going on in the world today.