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Military Intelligence officer, Captain Callum Ferguson has been given just 6 days to persuade a German scientist to work for the British. His task is complicated by the scientist's young daughter and a determined war crimes investigator.

Callum employs unorthodox methods to try to convince Dieter to work for the British, ultimately putting Lottie at risk. Kathy continues to seek evidence that the Government is harbouring war criminals in the name of science.

The search for Lotte forces Callum to choose between his brother and his orders. Callum eventually brings evidence to Kathy about German scientists given new identities and the pair attempt to stop an important figure leaving the country.

Callum is instructed to dispose of all information regarding 'individuals of interest'. His relationship with Rachel becomes more compromising and his dealings bring him closer to ex-Foreign Office official Harold.

Cal introduces Lindsay-Jones to Frau Bellinghausen whilst Eva and Rachel organize a fashion show, interrupted by Victor, who gives his brother evidence of Dieter's allegiance to the Nazis, illegally obtained, with Cal stepping in to prevent Victor's arrest. Cal also unearths a plan by Lindsay-Jones and others to have tried to avoid the war whilst Kathy discovers the location of Birgit Menz, a witness to Dieter's past and is persuaded by Cal to entertain her, though she gives away nothing. Dieter however surprises Cal with an announcement and Victor is angry when Kathy refuses to look at more evidence that he has discovered and reveals the treatment of Birgit, overheard by Salter.

Following his outburst Victor is placed in a psychiatric ward where visitors Rachel and Cal inform him of Dieter's pal to marry hotel waitress Anna - which clearly unsettles him as he persists in declaring the German to be a Nazi collaborator. Making his escape he encounters secret service agent Salter, who warns him against exposing Dieter for Cal's sake and the youngster attempts an unsuccessful suicide bid. Some days later Lindsay-Jones makes a speech at the Foreign Office, supposedly to present the appeasement party's viewpoint and criticize Churchill's belligerence though he ultimately back-pedals. Cal is shocked, especially when Li9ndsay-Jones comes out with the truth.

Kathy is disgusted to learn that Bergit was a Nazi collaborator, hoping to save herself by indicting Dieter and leans on her to give evidence. Dieter himself marries Anna with Cal as best man as Victor is released from hospital. Aware that Alex knows of his affair with Rachel Cal gives a wedding speech with an anodyne content. Frau Bellinghausen gives the formula to Cal but Victor tries to persuade Lindsay-Jones that Cal, aware of Dieter's true background, is out to kill Dieter. However it is Lindsay-Jones, atoning for his earlier actions, who decides the outcome for all concerned, allowing a happy ending for the Ferguson boys as Cal ends up with his chosen girl-friend..