Season 1, Episode 3
Everyone puts aside their differences in the search for Lotte, but Callum is forced to make a difficult choice between his brother and the orders from his superiors. Believing he is free to both protect and prosecute the Germans as he sees fit, Callum eventually brings Kathy some information about scientists who have been taken to safe houses and given new identities. Kathy and Callum work together to prevent someone important from leaving the country. With encouragement from her husband Alex, Rachel, an enchanting Anglophile American, gets closer to Callum.
Close To The Enemy follows intelligence officer Captain Callum Ferguson, whose last task for the Army is to ensure that a captured German scientist, Dieter, starts working for the British RAF on urgently developing the jet engine.