The story reflects the physical and psychological shock Conrad himself experienced in 1890, when he worked briefly in the Belgian Congo. The narrator, Marlow, describes a journey he took on an African river. Assigned by an ivory company to take command of a cargo boat stranded in the interior, Marlow makes his way through the treacherous forest, witnessing the brutalization of the natives by white traders and hearing tantalizing stories of a Mr. Kurtz, the company's most successful representative. He reaches Kurtz's compound in a remote outpost only to see a row of human heads mounted on poles. In this alien context, unbound by the strictures of his own culture, Kurtz has exchanged his soul for a bloody sovereignty, but a mortal illness is bringing his reign of terror to a close. As Marlow transports him downriver, Kurtz delivers an arrogant and empty explanation of his deeds as a visionary quest. To the narrator Kurtz's dying words, "The horror! The horror!" represent despair at the encounter with human depravity--the heart of darkness.
