John LeCarre says...

"A good writer is an expert on nothing except himself. And on that subject, if he is wise, he holds his tongue."

His bio on his own website is crafted to this ideal.

I'm currently listening to "The Mission Song". Enjoying it, though it's a bit pedantic, and hard to follow some of the logic, given that I'm not as well acquainted with the politics of the Congo and Rwanda as I might be. Some of my difficulty might also have to do with the abridgment for audio -- I suspect they may have cut some critical details in the interest of recording time. However, the audio rendering is quite good...I really like the narrator.