Kenya's Dennis Kimetto holds the world record of  2:02:57 in a marathon. All eyes will be on the world class runners Sunday, November 1st when the New York City Marathon takes place. Will any of them flirt with the record or what seems to be the impossible, a marathon under two hours.

Author Ed Caesar spent three years researching for his new book "Two Hours, The Quest to Run the Impossible Marathon." He spent time with many world class runners, including current world record holder, Dennis Kimetto.  This book talks about more than training including statements and research as to why New York City should be considered the birthplace of the marathon.  Caeser gives you an inside look at what it would take for a world class marathon runner to eclipse the impossible two hour mark.