Fagan sketches the journey of Neanderthals and Cro-Magnon (his term for anatomically modern humans) out of Africa and shows how the severe ice age likely brought about the demise of Neanderthals. He really sticks to the data when discussing the climate changes and archaeological evidence. However, he postulates wildly in other areas, particularly when it comes to gender differences and how Cro-Magnon's might perceive Neanderthals.