Tonight, PBS is going to treat us to the first of three installments of "Silk." The show from across the pond is written by Peter Moffat and features Maxine Peake ("Little Dorrit") and Rupert Penry-Jones ("MI-5"). They are, we have been informed, rival barristers, which is nice because if all the barristers are on one side and the other side has no barristers, well that side is going to lose, isn't it? You have to have equal and opposite barristers. The show will air as a part of PBS' "Masterpiece" series of programs.