I usually try to read books in a series in order, but I must have just picked up #4 at some time, after reading The Cleaner, the first in the series. I think maybe for this series it might not matter that I skipped #2 and #3, unless I missed a lot of character and relationship development.
Jonathan Quinn is still working as a cleaner, a guy who is hired by governments and corporations to make sure no evidence or bodies are left at a crime scene or murder venue. He is quite expert at his job and even has an apprentice, Nate, learning all his techniques and strategies.
But when Quinn is hired once again by a wealthy English go-between, things become confusing. He is not sure anymore who is a good guy and who are the bad ones. Quinn does have his own moral code and thinks he represents justice and the good guys. But, people are being killed, and other people are killing the killers. What the heck is going on? Once he does figure things out, he and Nate also become targets to be eliminated. Oh my!
Unlike Jack Reacher who can beat up everyone or kill them or maim them, Quinn is a much more realistic main character. He is not hired to do those things, just to make sure no evidence is left at the scene. But when he inadvertently does have to take care of a live person, he can defend himself. There is non-stop action, a little romance, and a little humor, but not much. I will probably read another in the series.