Also Wilbur Smith, The Triumph of the Sun, mostly set in Khartoum and vicinity at the time of the siege by the Mahdi. Published about 2005 but made 10/7 seem like "business as usual."
You might like “Conquerors: How Portugal Forged the First Global Empire” by Crowley. This really gave me a much better understanding of the Indian Ocean’s opening to the west.