The Secret Service Season 1 Episode 4
Episode Title: The Feathered Spies
Countries:
United Kingdom,
Airing Date: October 12, 1969
Runtime:30 min
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The secret development of the new XK4 fighter aircraft has been jeopardised by De Groot, an expert in industrial espionage, who has blackmailed ornithologist John Masden into attaching miniature cameras to his domesticated pigeons for illicit surveillance. Investigating, Unwin and Harding discover that De Groot plans to use the birds to bomb Crayfield Airbase.