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Historian Adam Zamoyski discusses his new book, Phantom Terror, which reveals how Europe's rulers lived in fear of conspiracies in the years between the revolutions of 1789 and 1848. Meanwhile, crime writer Val McDermid highlights some of the scientific techniques that have been used to catch criminals in the past Hosted on Acast. See acast.com/privacy for more information. Learn more about your ad choices. Visit podcastchoices.com/adchoices