Let's just say that this was not the best book ever (shocker!), and it's best consumed, as I did, on a very long plane ride. Beyond that, I'll let Brown's sparkling prose speak for itself:

Langdon remained silent a long moment. “Actually, Katherine, it’s not gibberish.” His eyes brightened again with the thrill of discovery. “It’s . . . Latin.”

Aha! Code breaking at its finest.