Absolutely nothing like the movie. Literally the only thing they kept was the name. But that being said, it was a solid “meets expectations” for a spy action novel! Lots of guns, adventure, mythology, and subterfuge to take down the evil Nazis.

My critiques are that it was too long — this plot was NOT complex enough to merit nearly 400 pages. The middle really dragged with one too many missions and became a slog. There were also too many characters in the spy team to keep track of, which cheapened the ending because I hadn’t spent enough time with any individuals to really care what happened to them in the climax.

Because of the length, I would hesitate to recommend it to anyone, but the spy tropes are well executed, so fans of the genre would probably enjoy it.

If you love Steve Berry books then you will love Argyle! It is your classic lone wolf recruited to be a spy.  The book is NOTHING like the movie so don't expect there to be any similarities. As far as I can tell is they used the names and that is pretty much it.
The writing kept me hooked and you can't help but love Argylle. It is an enjoyable read.