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The novella is quoted extensively at the beginning and throughout the episode. It's described as being written in 1899, nine years after Conrad visited the Congo Free State as a merchant seaman. The hosts use passages from the book to illustrate the horrors of Leopold's Congo.

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Explicitly referenced as 'his brilliant book' that the hosts have 'mentioned quite a lot.' They quote from it describing the appeal of the Congo to adventurers, and later mention it contains 'long narratives of kind of these hideous, bloody mutinaries.' The hosts note they will discuss critics of this book in a future bonus episode.

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Referenced as 'another great book on the Congo by David van Raybroek, a lot of it based on oral history.' The book is cited regarding the practice of cutting off hands, noting that 'most of the people who had their hands cut off, I mean, they're already dead.'