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This article presents information on Martine de Bertereau and her husband Jean de Chastelet. The Baron de Beausoleil, were mining engineers, hired by an archduke, two emperors and a pope to rediscover long-lost mines and find new ones. In 1642, both baron and baroness were arrested and thrown into two of the most notorious gaols in France. The couple certainly had enemies. But Martine played right into their hands. Her mistake had been to boast about her ability to pinpoint rich deposits of minerals and metals and plentiful supplies of good water, but then to lie about how she did it. Unlike the charlatans who dress up their claims with fake data and pseudoscience, Martine de Bertereau did the opposite. She got results by careful observation and experiment but claimed it was all done with divining rods and other occult instruments.