Long-distance father William McKeen watched his son grow up during summers, holidays, and long weekends. Now, with Graham in college, the two take a summer road trip down Highway 61, the legendary road of the blues, from the Canadian border to the Gulf of Mexico. In cheap motels and smoky bars, with obscure bluesmen and barnstorming guitar heroes, they discover how the highway links rich and poor, black and white. In Minnesota and Iowa, William shows...