Plot details under wraps.
Michelle Dockery | Hugh Bonneville | Jim Carter | Dominic West | Paul Giamatti | Elizabeth McGovern | Joanne Froggatt | Allen Leech | Alessandro Nivola | Sophie McShera | Robert James-Collier | Laura Carmichael | Raquel Cassidy | Simon Russell Beale | Kevin Doyle | Brendan Coyle | Penelope Wilton | Arty Froushan | Lesley Nicol | Michael Fox | Douglas Reith | Harry Hadden-Paton | Phyllis Logan | Joely Richardson