Webster begins a campaign of resistance at the American hospital after Paris falls to the Nazis. Mr and Mrs Rossler are arrested in Berlin, and Lois grows closer to Vernon.
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.
Harry crosses paths with Lois again when she arrives to perform at the BEF base camp in France, while Tom finds himself in the middle of a naval battle in the South Atlantic.
On a Polish mission as part of the SOE, Harry grasps a second chance at saving Kasia from the horrors of Warsaw, while Lois looks set for happiness with new love, Vernon.
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.
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.
A month after the outbreak of war, Warsaw is unrecognizable, while Manchester, on the surface, appears very much the same. Will there be a warm welcome home for Harry?