“When I think of my life at Downton, it seems like another world,” the estate’s reluctant heir, Matthew Crawley, says as Season 2 ($19.99) of this addictive Masterpiece Classic series opens. It always seemed like another world to us, but with World War I raging, even life at the palatial Grantham residence is changing. Will Matthew and Mary reunite? Can Mr. Bates free himself to marry Anna? Or will scandal bring the whole crowd down? You can get ahead of the episodes currently airing with today’s DVD release. The perfect Valentine’s gift for your daughter, sister, friend—or yourself (you deserve it).