Isobel suggests using Downton as a place of convalescence following a distressing incident at the village hospital. Shell-shocked new valet Lang arrives as William gets his call-up papers, and Carson strives to keep standards high, but suffers a panic attack in front of the family. Lady Rosamund is eager to unearth Lavinia and Carlisle's secret after overhearing them arguing, and romance blossoms for both Edith and Mary.

Ethel's flirting with Major Bryant lands her in trouble as preparations get under way for a concert at Downton. Tensions flare between Isobel and Cora, Edith receives worrying news about Matthew and William, while Branson declares his feelings for Sybil. Mrs Bird's soup kitchen receives a helping hand from Daisy and Mrs Patmore.