The movie "The Constant Gardener" is based on a 2001 book by well-known author John le Carré. It tells the story of Justin Quayle, a British diplomat in Nairobi, Kenya, whose activist wife Tessa is murdered. Believing that there is more behind the murder, he seeks to uncover the truth behind her death. He finds an international conspiracy of corrupt bureaucracy and pharmaceutical money. Tessa uncovered a corporate scandal in which a large pharmaceutical company working under the cover of AIDS tests and treatments is testing a tuberculosis drug that has severe side effects.