Joanna Lumley always dreamed of one day seeing the mighty Nile. This trip of a lifetime marks a dream come true. Traveling by fishing boat, ferry, cruise ship, plane, train, car, and Zapcat, Joanna follows the world's longest river from mouth to source. The 4,000-mile journey takes her from the teeming city of Alexandria to the verdant forests of Rwanda, from the heat of the Sudanese desert to the highlands of Ethiopia, through multiple countries and across thousands of years of history.