Welcome back to Downton Abbey where life has changed quite dramatically since the outbreak of World War One.
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As William prepares to head off to war, Thomas returns to Downton. Meanwhile Lavinia is reunited with an unwelcome face from her past.
The Dowager Countess is determined to uncover Lavinia's secret but will Mary help? And there's panic below stairs when Branson offers to lend a hand...
Violet and Mary ponder whether Sybil has a suitor, while Lord Grantham tries to track down Bates and there's disturbing news from the front line...
Ethel is struggling to cope and with Mrs Hughes' help, tries to make contact with Major Bryant.
The war finally ends but Mary is under pressure to save her family from scandal and a Canadian visitor claims to have links with the Granthams.
Matthew has some surprising news and Ethel introduces her son to his grandparents. But will they offer her any help?
In the final episode of the second series there's a mixture of joy, heartache and tragedy at Downton Abbey.
As we return to Downton Abbey, there's tension in the air between Sir Richard Carlisle, Lady Mary and Matthew...