In Sugeton Bay near Marseille, an experienced diver who was exploring the Le Guen cave had an accident. The cave has not yet been fully explored; entering it can be dangerous. On its walls, cave paintings of primitive people have been preserved, and among them is an image of a murdered half-man, half-beast. And in the most recent photographs taken by the victim, a figurine of a man with the head of a deer is visible, and it was clearly restored not so long ago. A mysterious huge black shadow was also imprinted on them...