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As 165 Eaton Place reopens its doors, two new arrivals make their mark. But whilst Sir Hallam's forthright aunt Blanche disrupts life upstairs, feisty new maid Beryl struggles to adjust to life in service. Meanwhile, Lady Agnes' concern for her children reveals a dark secret about Mr Pritchard. Sir Hallam's preoccupation with burgeoning Nazi Germany leads him into dangerous waters, and a chance meeting with an unexpected face unlocks a hidden desire within.

Lady Agnes catches the eye of charismatic American millionaire Caspar Landry but, as she and Sir Hallam look to their future, a tragic turn of events leaves their promised dreams - and a close family member - in jeopardy. Downstairs, Mrs Thackeray makes a momentous decision, which throws the running of the house into chaos. Blanche and Mr Amanjit continue to clash, until a heart-breaking cause compels them to reconsider their differences.

Blanche comes face to face with her former lover when a scandalous novel is published and, when the passion between the pair reignites, begins to consider a life away from Eaton Place. Downstairs, Beryl's decision to take a stand causes serious ructions to the running of the house until a familiar face offers wise words. Meanwhile, when Lady Persie reveals a shocking secret to Sir Hallam, the pair get ever closer as Persie is forced to make a life changing decision about her future.

Harry, deemed too old to participate in a local boxing championship, takes Johnny under his wing to teach him the ropes. With Lady Agnes being drawn to the charms of Caspar Landry and Sir Hallam's growing infatuation with Lady Persie, this once happy couple seems to be drifting further apart, much to the pleasure of Lady Persie who seems to be getting far too much enjoyment from the conquest of her sister's husband. Mr. Amanjit finds himself a target of racial discrimination.

As 165 Eaton Place prepares for the Annual Servants' Ball, Mr Pritchard enjoys a romance with fellow servant Miss Whisset, and starts to wonder if there is more to life than service. With war looming, Harry has a proposition for Beryl, however, a shocking revelation threatens to thwart their plans. Meanwhile, as Lady Persie and Sir Hallam continue their torrid affair, Sir Hallam is about to discover just how destructive his actions have been.

On the eve of war, Beryl and Harry face a race against time to get married. Meanwhile, Mr Pritchard makes a decision which throws the running of the house into chaos, until an old face lends a helping hand. And as Lady Agnes returns to London, a dark discovery has explosive consequences for all inside Eaton Place and changes their lives forever.