In the final episode Zeinab Badawi travels to several countries and looks at the early spread of Islam in Africa and how many Africans practise to this day a mystic, Sufi form of the religion. She shows how Arab culture came to influence a large part of the continent — particularly in the north. And she charts the rise of the powerful Islamic dynasties of North Africa, that built magnificent monuments, mosques and empires — including a part of southern Europe.