The Author followed during 21 years the fight of Dr John Garang de Mabior. The relations they had allowed to raises some unknown details and to describe Garang's character, his mind-set, his vision and the way to victory and especially his mysterious death which changed the history of Sudan. Many meetings and long discussions with Dr John Garang had allowed to understand the roots of the conflict. From the beginning of his rebellion war, in 1983, Garang had always fought for the concept of a new, united Sudan in which a secular state would give all regions and ethnic groups equal social status, a share of the national wealth and political access. The secession showed in South Sudan how difficult is to govern a multi- ethnic Nation even if it is black African.