Captain Joe Martin meets with American journalist Martha Franklin to demand that she hand over incriminating evidence. Christmas celebrations at the Royal Military Police base are cut short by a shocking discovery.

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