Set in a bomb-damaged London hotel during the aftermath of World War II, thriller "Close To The Enemy" stars Jim Sturgess (One Day) as British intelligence officer Captain Callum Ferguson, whose last task for the Army is to ensure that a captured German scientist, Dieter (August Diehl), hands over secret cutting-edge military technology crucial to national security. Callum employs unorthodox methods in his attempt to convince Dieter to work for the British, developing a friendship with him, which is soon threatened as the German's involvement in the Nazi war machine may be more than it initially seems.

In this original six-episode miniseries, Callum encounters a number of other characters include Victor (Freddie Highmore), Callum's younger brother, struggling to deal with psychological trauma caused by his experiences on the frontlines; Harold (Alfred Molina), a Foreign Office official who reveals some startling truths about the outbreak of the war; Rachel (Charlotte Riley), an enchanting Anglophile American engaged to his best friend; Eva (Angela Bassett), a confident American jazz singer who breathes life into the old hotel with her music; and Kathy (Phoebe Fox), a tough, young woman working for the War Crimes Unit, fighting to bring war criminals who escaped prosecution to justice.