Death on the Line: The MacKay Mysteries, Book 1 by Carol Amorosi
My rating: 3 of 5 stars

1763 Charles Mason and Jeremiah Dixon are sent to the States to re define the boundary between the American colonies of Pennsylvania and Maryland hiring Angus Mackay as their assistant.
A lot about the methods of Mason-Dixon but no real mystery until approximately the 40% point.
Overall enjoyable enough of a mystery

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