In February 1923, Albert Einsten visited Barcelona to explain his Theory of Relativity, invited by Esteban Terradas, a Catalan physicist. However, the real objective of his visit was very different and dangerous.
Ninety years later, Inspector Ponce investigates the murder of an antiquarian who had kept safe the of Héctor Jubany, assistant to Terradas in the construction of Line 1 of the Barcelona underground metro. The case will take the inspector to historical buildings in thecity, where he will discover the extraordinary connection between the two scientists and the legacy that Terradas protected in order to hide an object that would spark terrible crimes in the wrong hands.
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