Aswan is a Nubian city in the south of Egypt, on the first cataract of the Nile - where Agatha Christie wrote her murder story.

Here, I fall into a pattern; up at four thirty in the morning; I dress and put my photo gear together.  Then, for eight cents, I take an engine-powered ferry and cross the Nile.   I sit knee to knee, the only white man in a boat filled…