Episode Title:
The Feathered Spies
Episode Description:
The development of the new XK4 fighter plane has been jeopardised by industrial spy De Groot, who has blackmailed ornithologist John Masden into fitting cameras to his domesticated pigeons to carry out illicit surveillance. Investigating, Unwin and Matthew learn that De Groot plans to use the pigeons to bomb Crayfield Airbase.
