A team of scientists are brought together to find a way of travelling back to the Stone Age, to the dark days when brutual primeval tribes tore the world away from the Neanderthals.  Stripped of the trappings of civilisation, mathematician Barbara Hamilton is hurled backwards in time to the darkest era before the dawn of history.  To survive, she must fight the savage beasts of the barbarous world and against the predatory instincts of the greatest hunter the world has ever known – Cro-Magnon Man.