Narrated by Marc Maron and directed by Scott Rosenbaum, this documentary explores the legacy of blues musicians Pinetop Perkins, Willie "Big Eyes" Smith, and Hubert Sumlin, best known for their work as sidemen for Muddy Waters and Howlin' Wolf. The film includes their last concerts and interviews before they passed away, and also celebrates their lives via accounts from the next generation of musicians who were inspired by the trio.