Robert Johnson was one of the most legendary and mysterious Delta Bluesmiths of all time. Little is known about his life, but his music has influenced many different artists, like Eric Clapton and Keith Richards. Now, John Hammond Jr., son of legendary record producer John H. Hammond, who also organized a concert for Robert Johnson right before he died, goes to the Deep South to learn more about this amazing man, trying to find information about Johnson's birth date, place and parents, his early musical development, performances and travels, romances, his mythic "pact with the devil," his untimely murder in his late twenties, the discovery of possible offspring, and the uncertainty over where Johnson is buried. Throughout, Johnson's music is both foreground and background, from recordings of Johnson and as performed on camera by Hammond, David Honeyboy Edwards, and Johnny Shines.