The NLF want to make a trade. Alison watches over Ed, feeling conflicted about their marriage. Yusra smuggles a coded message to Armstrong and Joe decides to go against his orders.
Joe's future in the Army hangs in the balance as Honor struggles to cope with the revelations about his past. Markham is torn between his duty and his conscience and Armstrong fears for Yusra's safety.
The RMP begin their desperate search. Tilbrook takes Markham to visit an important prisoner. Alison confides in Honor about her affair and can't go on with her pregnancy.
Captain Martin meets with American journalist Martha Franklin to demand she hand over incriminating evidence. Christmas celebrations at the base are cut short by a shocking discovery.
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.
Newlyweds Capt Joe Martin and his wife Honor arrive in the British colony of Aden where he is to replace a much-loved captain. Lt Ed Laithwaite meets an NLF informant who warns of an attack.
