VIDEO: Sneak Peek - Episode 7 of PBS's DOWNTON ABBEY

Below, catch a sneak peek of a scene from the next episode of PBS's Downton Abbey airing this Sunday, February 17th!

Downton Abbey has weathered the war, and the prospect of an impending wedding for Mary and Matthew brings great anticipation, as well as Cora's mother from America, Martha Levinson. New World and Old World are about to clash as Martha tests tradition at Downton, and the patience of the formidable Lady Violet.

Aside from the sparks upstairs, a very real crisis threatens the foundation and future of Downton. Great houses have been crippled psychologically and financially in the wake of World War I, and Downton may not be exempt. In response, Robert clings decisively to his duty to maintain the home at all costs. But in this changing landscape, nothing is assured, and even the Crawleys may be faced with a new battle to safeguard their beloved Downton.

Amidst sweeping social change, budding romances and surprising betrayals, Downton Abbey returns with a riveting third season starring Maggie Smith, Hugh Bonneville, Elizabeth McGovern, Shirley MacLaine and the rest of stellar cast in the award-winning series from Julian Fellowes.