The Constant Gardener is a gripping thriller by John le Carré. The story follows Justin Quayle, a British diplomat who investigates the murder of his wife, Tessa. As Justin delves deeper into the conspiracy surrounding her death, he uncovers a web of corruption, pharmaceutical companies, and government surveillance. With its intricate plot and compelling characters, The Constant Gardener is a suspenseful read that delves into the dark underbelly of international politics.