Public domain. Cover image from Project Gutenberg ebook #64755. Citadel of the Green Death by Robert Emmett McDowell Download .m4b · 145 MB How to listen → · Problem with this narration? Let us know → Narrator Arthur — English RP Narrator (en-GB) Length 2 hr 30 min Language English Added November 13, 2026 Source ebook Project Gutenberg License Public domain FictionScience Fiction