Show of the week: Masterpiece: Upstairs Downstairs

It’s been 36 years since the last Upstairs Downstairs, but only six years have passed at 165 Eaton Place. The house is now empty of the drama that enthralled viewers in the 1970s, but a new couple is moving in, and soon there are big doings—including a party to which American socialite Wallis Simpson is bringing a surprise guest. Actresses Eileen Atkins and Jean Marsh, the series’s creators, are both splendid in this three-episode sequel, which should delight old fans. It may even snare a whole new audience. Sundays, April 10–24, at 9 p.m., PBS; check local listings