The Last Missionary is a bicycle adventure story set in remote districts in eastern Democratic Republic of the Congo. Bob Walters travels with a team of Congolese colleagues discovering the state of the villages run over by the Pan-African war that devastated the region's people through the terror of rape and the killing of millions.

Along the way, Bob offers the reader a number of short tutorials and reflections on missiology, the study of mission systems. He ponders patronage and cargo cults, and asks the question, "Is Jesus the answer?" But this is not an answer book, it is a book in search of better questions.

The Last Missionary is a challenge to both evangelicals and progressives in the church, missionaries and mission volunteers, and even non-religious aid workers.