If there is a book from and about Namibia everyone travelling through the country should read, it is "The Sheltering Desert" by Henno Martin. It is definitely one of the books that I always name when getting asked about my favourite books of all time.
View Kuiseb Canyon - The Sheltering Desert in a larger map
Threatened with the internment for the duration of World War II, two young German geologist, Henno Martin and Herman Korn, sought refuge in the Namib Desert and lived a Robinson Crusoe existence for two and a half years. How they mastered their situation, what they did, thought and observed are the subject of The Sheltering Desert. In it lies the vastness of the landscape, the clear skies, nature's silence in the joy or suffering of her creatures, and the stillness in which the reader, too, may take refuge from the wrongs of civilisation.
The Sheltering Desert is also know by it's German title "Wenn es Krieg gibt, gehen wir in die Wüste".