It always helps when the reader of the audio book (David Drummond in this case) is engaging, and this was definitely an example of that. It actually felt like he was the one who wrote it, it was so smooth.
The content is fascinating; exploring spy technology from the old OSS up through now. It was really cool to hear about how audio surveillance has changed over the years. Today we forgot just how much transistors and integrated circuits have truly shrunk things.
Another great aspect is the personal touch, the book is not just about the technology but the people in the OTS ("techs") who deploy (frequently at high risk) the surveillance or even defuse bombs.
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