Lionus Walker is a young Black scientist who, with the help of a boat and a local medicine man, makes a journey along the Mississippi River to take a leprosy patient to Carville, Louisiana. Fleeing the dangerous man hunting him, Lionus discovers that the waters of Ol’ Blue do not offer freedom from the past, but instead, provides a direct roadway to it. But is it possible for the old tub to go even farther? --- possibly to Harvard?