The book investigates the complex history of Christian missions in the Congo, challenging the notion of the region as solely "The Heart of Darkness." The author, R. R. Hall, a medical doctor with personal ties to the Congo, examines the country's history before European arrival, the impact of Belgian colonization, and the role of missionaries in exposing colonial brutalities. Drawing on extensive archival research, interviews with missionaries and Congolese church leaders, and unpublished personal accounts, the book presents a nuanced perspective on the contributions of Christian missions to the development of the Democratic Republic of Congo.

The book offers a detailed historical account of Christian missionary activity in the Congo, aiming to provide a more comprehensive understanding than the prevalent "Heart of Darkness" narrative. It is based on thorough research, including archival records and personal testimonies, suggesting a scholarly yet accessible approach. The inclusion of a Congolese perspective via a postscript by Norbert Mpu-Mbutu indicates an effort to present a balanced view of the missions' impact. The work appears to be a significant contribution to the study of Congolese history and the role of religion in colonial and post-colonial contexts.