 She also criticises his use of the key terms 'prehistory' and 'civilisation', which he fails to define, arguing that he misuses them, and points out that he uses the term 'tribalism' to describe prehistoric cultures although we do not know if there were tribes in prehistory.She concludes that "One must grant that the alleged controversy and conspiracy, the simplistic plot and biased discussion, all help to make the book entertaining.The entertainment, however, comes at considerable cost", the cost being at the expense of the work of the prehistorians whose research made his book possible."