In episode four, Graham launches into what looks to be the toughest leg of his journey Africa. Red tape forces him to make a 4,000 kilometre detour as he crosses the Sahara Desert, and in Senegal Graham faces his biggest challenge yet: finding passage to the Cape Verde islands 600 kilometers off the African coast. Time is ticking and he bites the bullet, taking to the high seas in a leaky wooden pirogue. The welcoming party awaiting him is not what he expects.