1882. After the death of her father and accompanied by Peggy Scott, Marian Brook travels to New York to live with her aristocratic aunts, Agnes van Rhijn and Ada Brook. Meanwhile, determined to break into society, ruthless tycoon George Russell and his ambitious wife Bertha move their family into a lavish mansion across the street and prepare to throw their first soirée.

Tom Raikes’ visit to New York delights Marian but worries aunt Agnes. An increasingly desperate Peggy seeks legal advice from Mr. Raikes, George takes steps to further his latest business plans, Oscar van Rhijn homes in on young Gladys Russell, and a charity bazaar becomes the source of a dramatic stand after Bertha is slighted.

In the aftermath of a tragedy, George makes a deal to help Bertha. Peggy gets an assignment from publisher T. Thomas Fortune, but a dinner with her parents ends on a sour note. Marian learns more about the mysterious Mrs. Chamberlain. Bannister's visit to the Russell house has a lasting impact on the staff. Bridget shares her dark secret with Mrs. Bauer.

Bertha goes all out at a luncheon to impress Mr. McAllister, enlisting the help of Bannister — who rubs Church the wrong way. George fights to protect his public image, while Agnes’ status quo is disrupted. As Marian debates her feelings, Mrs. Chamberlain makes her an offer. Gladys bonds with a new friend. Armstrong intensifies her campaign against Peggy.

As the city buzzes over Edison’s electricity demonstration, Bertha plans a picnic that involves Mr. Raikes — but not Marian. Agnes entreats her niece to protect the family’s reputation. George prepares for a legal battle as he bristles over Larry’s career ambitions. Bannister plots his revenge. Turner gets an unwelcome surprise.

As Marian prepares to embark on a new adventure, Ada and Aurora rush to stop her before it's too late. With Gladys' debut ball fast approaching, the clash between Bertha and Mrs. Astor has consequences for all of New York society. The discovery of a shocking letter changes everything for Peggy. Baudin lays out his double life.