Book 2- chapter 2 briefly describe the prisoner, charles Darnay. Why is he fascinating to the crowd?

An old clerk at Tellson's gives Jerry Cruncher a message to deliver to Mr. Lorry at Old Bailey, where Charles Darnay is being tried. Jerry makes his way into the trial and is reassured by an onlooker that this is indeed the treason case. The man gruesomely describes the quartering that is certain to follow as punishment. When the young gentleman prisoner, Charles Darnay, is brought in, the whole courtroom stares at him. He had pleaded not guilty the previous day. Darnay's gaze rests immediately on Dr. Manette and his daughter, who are to be witnesses for the prosecution.