"In my days only did I attain any measure of happiness. My nights marked the reign of fear--and such fear! I make bold to state that no man of all the men who walk the earth with me ever suffer fear of like kind and degree. For my fear is the fear of long ago the fear that was rampant in the Younger World and in the youth of the Younger World."Famous American novelist Jack London was one of the pioneers of the science fiction genre and is considered to be a great influencer. In this gripping fast-paced novel of prehistoric life a modern city man is haunted by visions of a much earlier period. He lives a second life in his dreams and tells a story of Mid-Pleistocene era through the eyes of his ancestor Big-Tooth and creates a convincing case concerning the development of humanoids into humanity.