Sahara (Dirk Pitt #11) by Clive Cussler

1996, Egypt. Searching for a treasure on the Nile, DIRK PITT thwarts the attempted assassination of a beautiful U.N. scientist investigating a disease that is driving thousands of North Africans into madness, cannibalism, and death. The suspected cause of the raging epidemic is vast, unprecedented pollution that threatens to extinguish all life in the world's seas.

Racing to save the world from environmental catastrophe, Pitt and his team, equipped with an extraordinary, state-of-the-art yacht, run a gauntlet between a billionaire industrialist and a bloodthirsty West African tyrant.