An old antique ring turns a college professor into a homicidal maniac when he puts it on. The ring originaly belonged to Jack the Ripper, and the Ripper's spirit possesses whoever wears it.

In 1872, in the cave of Cavillon in Monaco, archaeologist Émile Rivière (1835-1922) unearthed an apparently very old human skeleton, at least 24,000 years old, a discovery that changed the modern image of prehistoric men and women.

The events and coincidences that led to rapid advances in human intelligence 50,000 years ago.