Yale University Press says:
Hassan Abbas provides a nuanced and compelling portrait of this towering personality. Abbas reveals how, after Prophet Mohammad (peace be upon him), Ali assumed the spiritual mantle of Islam to spearhead the movement that the prophet had led. While Ali’s teachings about wisdom, justice and selflessness continue to be cherished by both Shia and Sunni Muslims, his pluralist ideas have been buried under sectarian agendas and power politics.
Today, Abbas argues, Ali’s message and legacy remains a powerful one of peace and tolerance.