Irving Finkel, an expert in the world's oldest writing, is called to Scotland Yard to help the police with an enquiry. In the museum's laboratory Rebecca Stacey is hunting for a trace of opium in a small pot 3500 years old. Meanwhile Colin McEwan attempts to try and crack a code - the silent language of the Nasca, the ancient and mysterious South American tribe, famous for etching huge symbols in the Peruvian desert.
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