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Story
Sixth-former Martin Clifford is plunged into the world of espionage and sabotage when he and his class see schools programmes from "The Voice of Truth". Forrester, an Intelligence officer, informs him that spies are planning to sabotage a local US Airforce base in his village. Can he identify "The Voice of Truth" in time?
Where to watch
In the UK, updated daily.
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Star cast
Full cast & crew
Seasons
Ended 1972 · 1 season · 13 episodes
