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.

A month after the outbreak of war, Warsaw is unrecognisable, while Manchester, on the surface, appears very much the same. Will there be a warm welcome home for Harry?

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 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.

When war breaks, translator Harry Chase vows to help his Polish lover Kasia flee Warsaw, but how will he explain this to his sweetheart Lois, waiting for him at home in Manchester?

December 1939, and Tom fights for his life on board the HMS Exeter at the Battle of River Plate. Meanwhile, Harry and Lois have a more personal battle to fight.

Harry’s courage is tested at Louvain as he comes face to face with a German sniper, and Kasia’s resistance activity in Warsaw intensifies.

Harry leads his unit on the route to Dunkirk as they fight to make it onto the beach and aboard a ship. Grzegorz and Tom also struggle to survive the chaos of the evacuation.

June 1940. The Nazis have taken Paris with not a bullet fired. Webster and Albert's life in the city they love will never be the same again.

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. Season finale.