What books would I like, if I have liked all of the Dan Brown books so far?

There’s nothing at all wrong with being young and naive, provided you plan to (and eventually do) grow out of that someday. As an occasionally critical reader, I find Dan Brown novels to be a step above the dime-a-dozen “romance” type novels. Less believable plots, less believable characters, more action and equally silly writing in general. But you like them, so that’s where we have to start. (I would have liked them, too, “once upon a time”, but I do try to read a bit more selectively now.)

I don’t know if you can get them on audio books—I don’t do those at all—but anything you can get by Tom Wolfe (The Right Stuff, Bonfire of the Vanities and A Man in Full are three that I recommend) or James Lee Burke (action / crime novels set in Louisiana, Texas and Montana, and a Civil War novel that I recall) are very good. These guys know how to use the language—and then demonstrate that knowledge. They also have a good eye for realistic (even if sometimes outrageous) characters.

Carl Hiaasen is very good, and you would probably enjoy Elmore Leonard (you’ve enjoyed movies based on his books, I’ll bet). Maybe even Patricia Cornwell.

I would recommend The Dark Tower series by Stephen King (that is if they’re on audio) or the Bartimaeus Trilogy.
Those re-ignited my passion for reading.

You might like the David Baldacci Camel Club books.

Try some Nelson DeMille or Jack Du Brul books, they are excellent, and available in audiobook form.

You might like something by James Rollins. His books are sort of a Dan Brown/Michael Crichton combo with a lot of action thrown in. The Sigma Force series is particularly entertaining, featuring a group of trained secret agents who also happen to be gifted scientists. I don’t know which ones are available as audio books, but you don’t need to read the books in order to enjoy or understand them.

The Rule of Four by Ian Caldwell reminded me a lot of dan brown’s books.

If you like fantasies, or are at least open to them, try A Song of Ice and Fire series by George R. R. Martin. It’s such a big franchise, I can’t imagine them not having audio books.

R.A. salvatores the legacy…by random house… is a good audio-book