The Heart of Darkness by Joseph Conrad is a classic novel that follows the journey of Marlow, an ivory trader, as he travels up the Congo River in search of the mysterious Mr. Kurtz. Along the way, Marlow encounters a variety of characters and experiences that challenge his preconceptions
From Wikipedia
Heart of Darkness is an 1899 novella by Polish-British novelist Joseph Conrad, in which sailor Charles Marlow tells the story of his assignment as steamer captain for a Belgian company in the African interior. The novel is widely regarded as a critique of European colonialism in Africa, whilst also examining the themes of power dynamics and morality.