(Audio)Book Recommendation?

I’m trying to decide on my next audiobook. The current front-runners are Panama Fever and This Republic of Suffering. I’m interested in both, but not desperate to read either. I’ve glanced at the pictures in Panama Fever in the bookstore, and I worry a little that following the story would require reference to the maps that wouldn’t be available on audio. I also like mysteries/thrillers on audio, but nothing is jumping out at me now.

Anyway, thoughts? Suggestions?