I really enjoyed "By Order of the President," even though it made me a bit sad as it was the first of Griffin's works that I have read since his passing. That being said, I haven't read a ton of his stuff by any means, so perhaps I cannot comment on whether it is one of his better ones or not (which I see many are claiming it is NOT.)
The story follows 160th SOAR (special forces) pilot Charley Castillo who is on a special assignment working for the Department of Homeland Security, and who also technically works for the Secret Service, and who also owns multiple private companies, and who also holds dual citizenship in Germany and in the United States, and who also has a Tex-Mex last name and was raised mostly by a family that holds dual citizenship in Mexico and the United States. Whoa. That's a lot, but that's really one of the major themes of the book that Griffin executes really well. Castillo often comments both to himself and his close friends around him that he is having trouble understanding who he is, and/or who he actually works for. The answer to that, in part of course, is in the title of the book.
Griffin tells a fairly complex story well, providing both Castillo's unique background (perhaps a little unbelievable but interesting nonetheless) and a fast paced story of Castillo and his close circle of friends and fellow good guys who are racing against the clock to stop a terrorist plot. As he does this, Griffin provides details on just about everything; helicopters, planes, the way rank structure works in the Army, descriptions of jobs, et cet. For some people that is too much, and frankly I understand that. For this reader (and I think probably a lot of former military but certainly not limited to) this was part of what made the read enjoyable.
Half of the plot is not simply Charley and his faithful friends stopping the terrorists, but the confusing and often shadowy operations run by the government and the troubles that come with that confusion. Griffin successfully shows how many countless instances there are of the left arm not knowing what the right is doing within the vast machinery of government, the squabbling between agencies and units (DIA, DOD, CIA, FBI, CENTCOM, Philadelphia PD, ODAs, DELTA) the rivalries between the commanding officers and/or bosses of said agencies and units, and the all too often struggle for people to know just who is in command. Personally, I thought that theme was almost more interesting than the plot of stopping terrorism in and of itself.
I agree with some other reviews, that Griffin doesn't need to include the thoughts in italics of his characters. I also think the "love story" (though it's a stretch to call it that) felt kind of like Griffin said to himself, "uh-oh, I have a story about a super cool agent, I better quickly throw in some woman he's interested in!" That woman's character was not really needed, was predictable and a little annoying. Girl likes Charley. Girl finds out Charley has been with many women before and is nicknamed "Don Juan." Girl decides Charley must be a womanizing jerk. But wait, Charley truly likes her. Hinted at by end of book that Charley may still have a chance with girl. But hey, people like those little sub plots so it's pretty common to see them in books and movies. Perhaps she'll have more of a role in Presidential Agent #2.
Speaking of that, I definitely say the book was good enough to check out the next one. I recommend giving the book a shot.