The family face a shocking turn of events at Brooklands racetrack while Molesley and Daisy are put to the test.

Cast: Hugh Bonneville, Zac Barker, Antonia Bernath, Samantha Bond, Patrick Brennan, Laura Carmichael, Jim Carter, Raquel Cassidy, Paul Copley, Brendan Coyle, Michelle Dockery, Kevin Doyle, Sebastian Dunn, Victoria Emslie, Michael Fox