In the Greek countryside, archaeologists Dr. Pete Asilov and Professor Andre detonate dynamite in an abandoned mountain cave, uncovering petrified eggs in the blasts.

Later, as Andre investigates his half of an ancient map that tells of gold hidden in the cave, his business partner Dorman arrives with his associates Stravos, his driver and his girlfriend Sofia.

Further ominous clues, such as the decaying body of an ancient neanderthal woman, enforce Calliope's warnings, but the men are determined to find the treasure.

Shaken by its horrific scream, the men resolve to return to the cave for the treasure, blaming Stravos' death on would-be thieves from the nearby village.

Professor Andre, determined to see his niece safe, entrusts her with Pete who shares an affection with her and sneaks back to the cave in order to seal it.