The viking error

While jogging in Normandy, Éric Geoffroy, a young history student, discovers nine Viking shipwrecks exposed by an exceptional tide. His video goes viral, receiving 4 million likes and a ❤️ from Taylor Swift. But near the shipwrecks, archaeologists uncover a dark engraved stone. A disturbing historical error is engraved on it in Latin. Is it an authentic medieval forgery? Or is it a CIA plot to destabilize Greenland?
The Danish secret service is in a panic. The famous Scandinavian medieval specialist, Alexander Foskker, is tasked with investigating the Normandy beaches. He sets off accompanied by his daughter, Alba, a young and brilliant botanist. No sooner has she arrived than the fascinating young woman disappears into the dunes. Her discovery of a rare isatis reficiat flower will turn the history of Denmark upside down. And Éric's life.