Anna and Mary face a crisis and a figure from the past surprises those above and below stairs.

Cast: Hugh Bonneville, Laura Carmichael, Jim Carter, Raquel Cassidy, Brendan Coyle, Michelle Dockery, Kevin Doyle, Michael Fox, Joanne Froggatt, Matthew Goode, Rob James-Collier, Allen Leech, Phyllis Logan, Elizabeth McGovern, Sophie McShera