The Winds of War (1983)

S7E6 Accidental Discovery

A young boy unwittingly uncovers a government conspiracy, quickly finding himself entangled in the operations of MI5 and on the run. Lucas and his team work tirelessly to shield him from those determined to keep him quiet. Meanwhile, Harry gets an enigmatic message from his source in Russia, which might hold the crucial information needed to expose the high-ranking mole within MI5.