The old books are outstanding and the "Sum of all Fears", is a truly great read, but absolutely nothing like the Unholywood adaptation.
Loved the "Bear and the Dragon" and "Without Remorse". Read "Debt of Honor" and "Executive Orders". I had just gotten to the end of one and started the other when 9/11 happened. You'll understand why I mention that if you read them. The new books are mostly center on the original characters son, Jack Ryan, Jr.
Enjoy the Dan Brown books they're very easy to read and Vince Flynn is another favorite. Wish he was still with us also.
One of these days I'll go back and finally read "Patriot Games", "Cardinal of the Kremlin", "Red October" and "Clear and Present Danger"
Add Daniel Silva to your mix.
Read in order.
Great series.
Israel-centric rather than CIA/USA-centric.