Heart of Darkness is a novella written by Polish-born writer Joseph Conrad (born Józef Teodor Konrad Korzeniowski).
This highly symbolic story is actually a story within a story, or frame narrative. It follows Marlow as he recounts, from dusk through to late night, his adventure into the Congo to a group of men aboard a ship anchored in the Thames Estuary. The story details an incident when Marlow, an Englishman, took a foreign assignment as a ferry-boat captain, employed by a Belgian trading company. Although the river is never specifically named, readers may assume it is the Congo River, in the Congo Free State, a private colony of King Leopold II.