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The war reaches the sands of the Egyptian desert while bombs fall on Manchester, and Harry introduces an explosive force into Robina’s household, leaving her reeling.

As Harry struggles to adapt to the reality of desert combat, Lois still longs to leave home. In Paris, Henriette is in grave danger, and a mysterious stranger arrives at Robina’s.

As Stan and Rajib make a hasty retreat across the desert, Marga reasserts her commitment to the führer. Meanwhile, David is in peril in the skies over France.

As Kasia takes on her first assignment as an agent, Rajib’s military values are tested. Meanwhile, a familiar face comes to David’s aid

Tragedy strikes at the heart of Harry’s unit as the siege drags on in Tobruk. In Manchester, Kasia is confronted by more of the horrors of the war. In France, romance blossoms between David and Henriette.

Harry returns to Manchester, but Kasia is determined to leave. In Europe, Marga and Henriette must each make their escape, while north Africa becomes even more brutal for Rajib.