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Persie's suspicious behaviour puts Hallam's political career in danger. Lady Agnes discovers there's something wrong with her marriage. The looming war threatens the plans Harry and Beryl were making for their future.
While Hallam and Persie continue their illicit affair, Pritchard falls in love with a woman he meets during the preparations of the annual servants ball. Beryl and Harry prepare for a new life in America.
Harry joins the local boxing league to make an impression on Beryl, but it turns out that Johnny is the one with talent. Lady Agnes' friendship with Caspar Landry puts a strain on her marriage.
Two separate scandals threaten the family at 165 Eaton Place. To make matters worse, Lady Agnes gets into trouble with the Girls Friendly Society over her treatment of the younger maids.
Upstairs, Lady Agnes catches the eye of charismatic American millionaire Caspar Landry. Downstairs, Mrs Thackeray makes a momentous decision, which throws the running of the house into chaos. The events in Germany start to have an effect on the family.
There are two new arrivals at 165 Eaton Place, one upstairs and one downstairs. The death of a pet leads to revelations about Mr Pritchard.