Joseph Conrad 
Heart of Darkness 

"Heart of Darkness" (1899) is a novella by Polish-English novelist Joseph Conrad about a voyage up the Congo River into the Congo Free State in the heart of Africa. Charles Marlow, the narrator, tells his story to friends aboard a boat anchored on the River Thames. This setting provides the frame for Marlow’s story of his obsession with the ivory trader Kurtz, which enables Conrad to create a parallel between what Conrad calls "the greatest town on earth", London, and Africa as places of darkness. (Wikipedia)