On August 16, 1938, in Greenwood, Mississippi, Robert Johnson, one of the greatest bluesman of all time, died in near anonymity at 27. He had appeared on the local musical scene a few years earlier but was rediscovered and made popular by a generation of rock stars of the ‘60s and ‘70s. In 2014, two French cartoonists told Johnson’s story in their graphic novel Love in Vain. This documentary recounts their trip to Johnson’s home state, including interviews with a number of genuine bluesmen of the Deep South: R.L. Boyce, Watermelon Slim, Ben Payton, and Lucious Spiller among them.