Probably long shot: Secret Service books?

[charlatti]

Has anyone read any good books (nonfiction, though well-researched fiction could be fun) about the Secret Service? I found these three:
The Kennedy Detail (Good reviews, and I'll probably try that one, but I was hoping for a more recent take)
Within Arm's Length (Odd publisher not available at my library)
In the President's Secret Service (Mediocre reviews)