then you get embrawled in the mystery of who the man is and the code. and then the de-evolution of the tragedy of his demise. the emotional impact of what injustice he was served and what happened to him in the excruciating reality is only magnified in why didn't i know is this. >> charlie: we conclude with a conversation about the portrait painter lucian freud. we talk with david dawson and john richardson. >> he was just a very great artist who, to my mind, was the great portraitist of his day. he also had this extraordinary feeling, maybe inherited from his grandfather, of perceiving people's personalities. >> charlie: the acting of benedict cumberbatch and painting of lucian freud, when we continue. >> rose: funding for "charlie rose" has been provided by the following: >> rose: additional funding provided by: >> and by bloomberg, a provider of multimedia news and information worldwide. captioning sponsored by rose communications from our studios in new york city, this is charlie rose. >> charlie: benedict cumberbatch is here, one to have the most t