We're talking about Downton Abby, and yes, it's imperative that you watch it from the beginning.
It may be the best TV series we've ever seen.
From wiki:
Downton Abbey is a British historical drama television series set in the early 20th century, created and co-written by Julian Fellowes. The series first aired in the United Kingdom on ITV on 26 September 2010 and in the United States on PBS, which supported production of the series as part of its Masterpiece Classic anthology, on 9 January 2011.Wikipedia