When young Marian Brook (Louisa Jacobson) moves into the New York City home of her rich aunts, she gets caught up in the dazzling lives of her wealthy neighbors.Bertha Russell (Carrie Coon), wife of ruthlessly ambitious railroad magnate George Russell (Morgan Spector), can't seem to gain favor with the old-money families, like Agnes van Rhijn (Christine Baranski) and Ada Astor (Cynthia Nixon).