In 1945, W. Averell Harriman, US Ambassador to the Soviet Union, was presented with a carved wooden plaque of the Great Seal of the United States as a 'gesture of friendship' by a delegation from the Soviet's Young Pioneer Organization.
Unbeknownst to him, one of the first covert listening devices, invented by Leon Theremin was hidden within it and was subsequently used to listen in on the ambassador's conversations for six years before being discovered. This book uses remarkable tales like this to tell the story of how modern audio surveillance developed and its important role in the evolution of today's artificial intelligence.