John Le Carré, well-known and appreciated writer of "spy stories" with social implications, has set his novel "The Tenacious Gardener" in Kenya, between the banks of Turkana and the slums of Nairobi. 
It is the story of a brave English woman who, challenging the logic of the new global economy that leads to consider Africa as a laboratory for experiments and a dump for all kinds of rubbish, is killed. 
A gardening enthusiast together with her husband, Tessa Quayle had actually come into contact with the healthcare world in Kenya, between pyramid corruption and the "longa manus" of the medical multinationals.
It will be the husband, who will realize how little he knew about the deceased wife, who will investigate, looking for a burning dossier and why dangerous friendships, first of all with a local doctor. 
The film "The constant gardener", directed by Fernando Meirelles and starring Rachel Weisz and Ralph Fiennes, was based on the novel.