At Carnac, in the Morbihan, the multitude of menhirs continues to question archaeologists. The most recent scientific research has identified dozens of new alignments of stones, some of which lie under the sea. Why, in the Neolithic period, did men erect gigantic funerary monuments at Carnac, to the glory of dignitaries as powerful as the Pharaohs? From often minute clues, scientists try to pierce the grey areas that still remain on this site and this unique society that radiated and disappeared suddenly in the heart of Brittany.