The Constant Gardener, written by John le Carré, is a suspenseful novel that combines elements of political intrigue, corporate corruption, and surveillance. The story follows Justin Quayle, a British diplomat, as he investigates the murder of his wife, Tessa. As Quayle delves into Tessa's work uncovering a pharmaceutical conspiracy, he becomes entangled in a dangerous web of surveillance and deception. Le Carré's masterful storytelling keeps readers engrossed from start to finish.