In the end, the story is about the difficulty of communication. Marlow tries to tell his story to the men on the ship, but he doubts they can truly understand. He tries to understand Kurtz, but Kurtz is an enigma. A Heart of Darkness PDF is a great way to explore this theme of isolation. The text is full of broken conversations and misunderstood messages. It is a book about the loneliness of the human experience and the struggle to connect with others.