The Royal Military Police must assist special forces on a dangerous mission. Mary Markham experiences complications with her baby's birth and Alison introduces Honor to the BP Club.

Cast: Jeremy Neumark Jones, Jessie Buckley, Essie Davis, Jessica Raine, Stephen Campbell Moore, Ben Miles, Tom Glynn-Carney, Julian Wadham, Richard Dillane, Ouidad Elma, Chris Reilly, Amanda Drew, Kal Naga, Aymen Hamdouchi, Louis Greatorex