"The Constant Gardener" is a novel by John le Carré that explores themes of love, betrayal, and corporate greed. The story follows Justin Quayle, a British diplomat in Kenya, who investigates the mysterious death of his wife, Tessa. As he delves deeper, he uncovers a conspiracy involving a pharmaceutical company conducting unethical drug tests on unsuspecting locals. The book was adapted into a film in 2005, directed by Fernando Meirelles. It highlights the impact of globalization and the exploitation of vulnerable populations. Through Justin's journey, the narrative critiques the moral implications of profit-driven motives in the medical industry.