A French farmer discovers a new Cro-Magnon archeological site on his farm in the French Valley of Vezzere. An out of place sarcophagus with engravings is found in the gallery of the cave where the walls are covered in colorful cave paintings. But the content of the sarcophagus is a mystery. Follow the story of the Cro-Magnon Children of Zorg and the Neanderthal Tribe of Nog that tells of a friendship between the two chiefs, Ulam and Nog. Unravel the mystery of the sarcophagus.