Huge advances in our ability to sequence ancient DNA have revolutionised what we know about the earliest human populations. David Reich explains the science, and tells the emerging story of our complex and often surprising ancestry - the extraordinary ancient migrations and mixtures of populations that have made us who we are. Reich's book reads like notes from the frontline of the 'Ancient DNA Revolution' with all the spellbinding drama and intrigue that comes with such a huge transformation in our understanding of human history.