Public domain. Cover image from Project Gutenberg ebook #73578. The mystery of Deneb IV auctore Robert Silverberg Detrahe .m4b · 22 MB Quomodo audiendum → · Problema cum hac recitatione? Animadversionem mitte → Recitator Arthur — English RP Narrator (en-GB) Diuturnitas 23 min Lingua English Additum November 4, 2026 Liber electronicus originalis Project Gutenberg Licentia Public domain FictionScience Fiction