Here is a book that I would like to buy and read...
http://www.wilbursmithbooks.com/home/index.html
The Quest
Published in South Africa on 14 March 2007 by Pan Macmillan.
The Quest will be published in the UK on 6 April, in Argentina on 3 April, in the Czech Republic on 3 May, in Italy on 10 May and in the USA and Canada on 15 May 2007.
Egypt is struck by a series of terrible plagues that cripple the Kingdom, and then the ultimate disaster follows. The Nile fails. The waters that nourish and sustain the land dry up. Something catastrophic is taking place in the distant and totally unexplored depths of Africa from where the mighty river springs.
In desperation Pharoah sends for Taita, the only man who might be able to win through to the source of the Nile and discover the cause of all their woes. None of them can have any idea of what a terrible enemy lies in ambush for The Warlock in those mysterious lands at the end of their world.
The Quest continues the story of The Warlock, Taita, wise in the lore of the ancient Gods and a master of magic and the supernatural. It follows on from River God, The Seventh Scroll and Warlock.

I have read all, yes ALL of Wilbur Smith books. BUT if you ask me what the story is, of the early ones, I dont remember.