This is typical pulp magazine stuff in book form. It is a story of Cro-Magnon man, packed with violence, suspense, brutality, horror and incredible speed. It certainly keeps you reading. But plot, dialogue and characters show amazing disregard for even the little knowledge we have of prehistoric life. The author thinks nothing of introducing a sent of Roman palace and social life into the midst of this prehistoric jungle, or a twentieth century love motif like ""He could not help but compare that fine, healthy well-rounded figure with the pallid, artificial women of his acquaintance!"" But the major outrage of the book -- and it is outrageous -- is the positively lustful ""love interest"". If this is a book intended for young people, and the jacket suggests it is, then the numerous ""hot"" passages are utterly unsuitable. That is putting it mildly. This is certainly something new in juvenile writing and highly offensive. The author evidently thinks he is creating another Tarsan series, for he ends with a promise of more to come. I devoutly hope someone will stop him before an outraged public opinion steps in to bar the sale of such a book for the young.