Bunkle Scents a Clue

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Bunkle is seventeen, and is spending a few weeks of the school holidays in Somerset, with his parents and his Scottish cousins. It is not surprising the the holiday proves less quiet and conventional than had been planned. Riding about the moors, they are annoyed by a fast Jaguar car. It's owner is traced to an ugly Victorian villa where a professor of science lives in conditions of suspicious secrecy.