All of humanity springs from a common source, but how? Drawing on National Geographic's Genographic Project, the largest anthropologic DNA study of its kind, Donovan Webster traces centuries of migrations, everywhere finding members of his now far-flung genetic family. In Tanzania's Rift Valley, he hunts with Julius, whose tribe speaks a click language; he wanders the ruins of ancient Mesopotamia with Mohamed and Khalid, now Jordanian citizens; in Uzbekistan, a circus ringmaster is a link to his primal bloodline. Webster's quest leads him to contemplate what traits he shares with those he meets, and here he reveals what their ways of life tell us about the deep history of our species.