The Constant Gardener, written by John le Carré, is a gripping suspense novel that explores the intersection of pharmaceutical companies, government surveillance, and corruption. The story follows Justin Quayle, a British diplomat, as he investigates the murder of his wife, Tessa. As Justin delves deeper into the conspiracy surrounding Tessa's death, he uncovers a web of deceit and surveillance that reaches the highest levels of power. This thought-provoking book raises important questions about the ethics of surveillance and the pursuit of justice.