The year is 1925. Within the family, unspoken truths and growing divisions cast a shadow over their shared existence. Meanwhile, those who serve in the lower reaches of the house navigate a world undergoing profound shifts in social custom.

Lady Mary’s interference has landed Mr. Carson in a delicate position with Mrs. Hughes. Cora and Violet find themselves at odds concerning the hospital's impending acquisition. Meanwhile, Robert faces a difficult choice.

The wedding of Mr. Carson and Mrs. Hughes is approaching, and preparations are in full swing. Edith is meeting with someone from her past. Meanwhile, Spratt seems to be harboring a secret.

With Tom and Sybbie once more established in life at Downton, the household—both family and staff alike—find themselves taken aback by the unexpected arrival of a familiar face, appearing under unforeseen circumstances.

Dinner at Downton brings Neville Chamberlain into the household, and soon he finds himself entangled in Lady Violet's scheme to secure the hospital's future, a venture that yields deeply unsettling results for all involved. Meanwhile, Andy …

The house has opened its doors to the public in support of the hospital, a move that has stirred disagreement within the family and among the household staff. Underlying tensions between Violet and Cora reach a critical point as discussions…

The Crawleys observed Henry’s participation in a motor race, an event that deeply affected Mary. Violet devised a scheme, one that took the family by surprise and pleased Miss Denker, while she gleaned further insight into Amelia's motives …

A sudden shift in Bertie’s fortunes leaves Edith grappling with a difficult choice: whether to reveal a truth of her past or maintain a carefully constructed silence. Mary contemplates the possibility of reconciliation with her sister as te…