[The Conversation Africa] Noo Saro-Wiwa is a celebrated Nigerian-born travel writer. Her latest book is Black Ghosts. It explores, with candour and compassion, the lives of several African economic migrants living in China, a group of people who are key to trade between the continents. As a scholar of African travel writing and mobility, among other fields, I read the book with keen interest and then asked Saro-Wiwa more about it.