Albert and Lisa continue to be suspicious of Curtis, whilst Lifeline is stretched to its limit trying to deal with several evaders. The Germans capture one evader, Sergeant Walker, who has travelled down the line and is familiar with several of Lifeline’s personnel. Walker makes a desperate bid for freedom to avoid talking and throws himself down a staircase at Gestapo headquarters. As Walker recovers in hospital, Lifeline deliberate over whether he can be rescued from the Germans or if he must be silenced to preserve the security of the line.

The Jewish population of Brussels is being systemically deported according to colour-coded identification papers developed by the Germans. Curtis becomes involved with a Jewish family hiding out in the city and asks Lisa if Lifeline can help, but Lisa is unwilling to put the line, which is supposed to help RAF evaders not Jews, at risk. Curtis himself is still under suspicion by Albert, when Lisa’s uncle, bank manager Gaston Colbert, identifies Belgian banknotes he brought over from London as forgeries. Kessler obtains some of the notes, and realises that they are too accurate to be real and have been made by the Belgian treasury plates, which were evacuated to London before the German invasion. He believes that the notes will bring him closer to Lifeline.

As Easter approaches, a monk from a local order, Father Girard, visits the Candide to hear Andree’s confession and also overhears a conversation about an evader. He offers his assistance to Lisa, who gratefully agrees that the airman can be hidden in the abbey over Easter. At the abbey, the head of the order, Father Pierre, is happy to help Lifeline, however another of the brothers, Brother Anselm, strongly believes that the order should not endanger itself by getting involved with the resistance and misguidedly contacts Kessler.

Curtis’ cover has been blown and Kessler knows that he is part of the resistance. To avoid endangering the others, Curtis goes to ground in Brussels. Knowing that Lifeline is at last in his sights, Kessler orders that all routes out of the city are blocked and co-ordinates a house-to-house search throughout the city. In desperation, Curtis goes to the Candide to ask for help, and Monique comes up with a highly audacious escape plan.

Dr. Keldermans visits the Candide with tragic news, and Albert must take decisive action if Lifeline is to continue. Meanwhile, Natalie has the difficult task of taking two eccentric Russian evaders down the line. Brandt dines with a high-ranking military acquaintance, Oberst von Elmendorff, who tries to recruit him in a military plot to assassinate Hitler, while Kessler invites Albert to a strange garden party.

Hoping to boost Lifeline’s flagging funds and gain some independence from London, Albert and Monique concoct a plan to sell three valuable Rubens paintings, replacing the originals with forgeries. However, Kessler is also aware of the paintings’ existence and plans to acquire them for Germany, setting out to remove them from the convent near Antwerp where they are held. Meanwhile, two American evaders, impatient with Lifeline’s security checks, decide to strike out on their own and ambush the car that Kessler is travelling in. Totally unaware of the true identity of their hostage, the Americans and their captive impose themselves on Hans and Lena Van Broecken, demanding that they are taken to Switzerland on their barge. Lifeline must not only retrieve the paintings, but also ensure that no harm comes to Kessler, as horrifying reprisals by the Germans are at stake.

Christmas is approaching, and Lifeline finds itself having to play Saint Nicholas when a wounded Group Captain is discovered by a group of abandoned children fending for themselves, who are prepared to sell the officer in turn for food and presents. However, Albert fears that it could all be an elaborate trap set up by the Germans. Meanwhile, Brandt finds his loyalties to Germany divided after recent events and confides his worries to Kessler.

Andre De Beers, a Belgian fighter pilot, is taken prisoner by the Gestapo and forced to watch his brother being tortured to death. De Beers overpowers his guard and escapes from Gestapo headquarters, seeking refuge with his old friend Alain. Determined to exact vengeance, he begins a campaign of killing German soldiers. After Kessler orders the capture and shooting of twenty innocent people in retaliation, Albert orders Alain to kill De Beers to stop any more bloodshed, however Monique and Natalie come up with an alternative solution. Albert is forced to stamp his authority on the others to preserve Lifeline’s safety when he learns that they have taken matters into their own hands. Meanwhile, as Kessler begins to launch an innovative new scheme to police Brussels, a communiqué from Berlin has shocking news for Brandt while sudden German radio silence indicates that a significant turn in the war is about to occur. The date is 6 June 1944.

Still languishing in prison, Albert learns that he was set up by the Communist leader Paul Vercors. Meanwhile, Dr. Keldermans makes a shocking discovery when examining an evader at a safehouse – the man is dying of bubonic plague. Lifeline’s personnel face the horrifying possibility of being wiped out by the deadly disease.

As Bradley’s army remains in hiding along the Dutch border, he and Natalie become closer as they work together planning the raid on the V2 site. To increase his chances of success, Bradley must try to obtain the rocket delivery schedule and plans to get the information by dining with Kessler at the Candide…. Meanwhile, Reinhardt is rapidly closing in on Lifeline, with Natalie as his chief suspect.

Kessler, still posing under an alias, and Reinhardt find themselves interned in the same prison camp for German officers. Kessler learns that Reinhardt surrendered himself to Albert at the Candide and is determined to dispose of him with a trumped-up court martial. Madeleine is forced to make a decision that will change her life forever. In Brussels, Albert and the others learn they are to be decorated for their selfless contribution to the war effort and Albert is given full ownership of the Candide as a reward for his bravery. However, it is a bittersweet victory for Albert as he has lost Monique, who is about to marry Captain Durnford and leave for a new life in England. The Second World War is over.