Just as I had hoped, this was a thoroughly satisfying end to the series.
One of the things I like most about these books is that no one is 100% good, or 100% bad. Every character, even the villain, has some good points. And the heroes have flaws, some serious.
Chief Baumgartner is a good study in leadership. He's not perfect, but he tries pretty hard to be the best he can be.
Detective Wardell Clint is a difficult hero to like. He is obviously intelligent, and quite tenacious n his dogged pursuit of justice. His departmental nickname, "Honey Badger", is well-earned. But he has his flaws, chief of which is being as prickly as a hedgehog. Quite difficult to deal with. He recognizes that he needs to work on his people skills, and does try, though not often successfully. One thing that bugged me just a little is that although Chief Baumgartner caught a lot of flack for an intensive off-book investigation, and Captain Farrell got fired because of it, Detective Clint, who actually conceived the idea of the investigation, and pretty much ran it solo, apparently suffered little or no repercussions.
I could go on, but no need.
In the afterward, the authors, both ex-cops themselves, point out that although corruption is a fact of life in most police departments and that reform is necessary, that corruption is usually tied to a small fraction of the department, and that the vast mast majority of police officers are hard-working men and women with a high degree of integrity.
Read the entire series!