Yes... it was believable, certainly. The acting was definitely top notch, and I have liked pretty much everything I've seen Duvall in. I personally just don't terribly enjoy dark movies.... an example was "There Will be Blood".... it was a well made, well acted movie, but I simply don't care for it, because of it's dark nature... personal preference. "No Country for Old Men" is similar, to a much lesser degree. While it had many dark moments, overall it was a good movie, in my opinion.