A US-set prequel of sorts to "Downton Abbey" from creator Julian Fellowes. Follows young Marian Brook, the orphaned daughter of a Southern general, who moves into the home of her rigidly conventional aunts in New York City. Accompanied by the mysterious Peggy Scott, an African-American woman masquerading as her maid, Marian gets caught up in the dazzling lives of her stupendously rich neighbors,led by a ruthless railroad tycoon and his ambitious wife struggling for acceptance by the Astor and Vanderbilt set.