When an eminent nuclear scientist goes missing en route to a nuclear power station it is a matter of national security. He is carrying top-secret plans for a nuclear processing plant to be built to store all the country's nuclear waste in a vast underground bunker at Downsend. This would, of course, involve a lot of disruption and upheaval for those already using the marsh. When the train arrives at Downsend the professor is missing. So what role did the miniature railway play in the Professor's disappearance?

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