Similarities in Conrad's "The Secret Sharer" and "Heart of Darkness" Joseph Conrad's books, The Secret Sharer and Heart of Darkness, both deal with each of our "dark selves". These books also have similarities which are overwhelming. In describing the true inner self of humans, Conrad used many symbols which have become apparent in many of his novels. Conrad uses the same or very similar objects in many of his works. Joseph Conrad wrote Heart of Darkness in 1899 to recount his voyages in the Congo. Conrad hid most of his meaning in his words