Codex Obscura

Secrets of the Voynich Manuscript

Non-Fiction - Historical
220 Pages
Reviewed on 03/26/2026
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Author Biography

Domingo Delgado is an independent researcher, author, and inventor whose work focuses on the Voynich Manuscript, medieval cryptography, Latin philology, and Renaissance Italian history. He is the founder of Delgado Research & Publishing and the author of Codex Obscura: Secrets of the Voynich Manuscript, a bold investigation proposing a historically grounded Latin-based reading framework for one of the world’s most mysterious books. Delgado combines technical reasoning, historical research, and close textual analysis in an effort to bring fresh clarity to a puzzle that has resisted explanation for centuries. He is also a patent holder and publishes ongoing research papers connected to his Voynich studies.
Here’s a slightly warmer version if you want it to sound more personal:
Domingo Delgado is an independent researcher, author, and inventor with a deep interest in the Voynich Manuscript, medieval cryptography, Latin philology, and Renaissance Italian history. He is the founder of Delgado Research & Publishing and the author of Codex Obscura: Secrets of the Voynich Manuscript. In his work, Delgado explores one of history’s most famous unsolved mysteries through historical context, linguistic analysis, and original cipher research. His goal is to present serious, evidence-based ideas in a way that is both rigorous and accessible to curious readers. In addition to his research and writing, he is also a patent holder.

    Book Review

Reviewed by Leonard Smuts for Readers' Favorite

The mysterious Voynich manuscript and its meaning have been the subject of speculation ever since its discovery in a Jesuit library near Rome in 1912 by an antiquarian book dealer, after whom it is named. It was originally the property of Emperor Rudolf II of Prague, and appears to date back to the fifteenth century. While some regarded it as a sacred text written in code or an artificial language, others dismissed it as a forgery. Domingo Delgado has used innovative methods to decipher it. He shares his extraordinary findings in Codex Obscura: Secrets of the Voynich Manuscript. He reveals that the manuscript was written in an encoded form of Latin. The content covers medicine, agriculture, and astronomy, which information would have been revolutionary at that time. It combines astrology and medicine in the diagnosis and treatment of ailments, uncovering a previously unknown herbal tradition with alchemical knowledge. The author identifies the plant species featured in the illustrations and confirms their exact geographic locations in Italy. A production process involving saline wine mixed with herbs to be used for healing purposes is described. This goes beyond being a folk remedy, extending to pharmacology and indicating an advanced understanding of the medicinal properties of plants.

In Codex Obscura, Domingo Delgado puts to rest the debate as to whether the Voynich manuscript was an elaborate hoax by providing a compelling explanation. His innovative research is commendable and provides solid evidence. It delves into intellectual life in Italy in the fifteenth century, when secret knowledge was often encrypted to keep it from those who would either not understand it or would misuse it. The church was also not open to new ideas and suppressed information, which had to be hidden in plain sight. Some notes on cryptography are included, confirming the manuscript's sophistication. The author continually questions whether he is correct in his interpretation, and cites earlier sources that offered contrary views. This book is only a partial revelation, with more detail to follow. The writing style is a successful blend of academic inquiry and everyday language. This work is meticulously researched and is enhanced by striking illustrations from the manuscript and other sources, as well as extensive appendices that include key Latin phrases, a glossary, samples of cipher glyphs, and details of the main role players. It provides a solution to a century-old mystery and will also appeal to those interested in medieval history, ancient documents, and cryptography.

Bruce T.

Codex Obscura: Secrets of the Voynich Manuscript is a bold, original, and deeply researched work. Domingo Delgado approaches one of history’s most puzzling manuscripts with impressive dedication and a fresh perspective that makes the book both intriguing and thought-provoking. Whether one agrees fully with the conclusions or not, the effort, scholarship, and creativity on display are undeniable. This is a memorable and worthwhile read for anyone interested in the Voynich Manuscript, historical mystery, and independent research at a serious level.

Katie Lee J

Codex Obscura: Secrets of the Voynich Manuscript is an intriguing and ambitious book that offers a fresh perspective on one of history’s greatest mysteries. Domingo Delgado clearly put tremendous effort into this work, and the result is thoughtful, original, and engaging. A worthwhile read for anyone interested in the Voynich Manuscript and historical research.

Lance A

Codex Obscura: Secrets of the Voynich Manuscript is an impressive and thought-provoking book. Domingo Delgado clearly put an enormous amount of research, effort, and care into exploring one of the world’s most mysterious manuscripts. The book is engaging, detailed, and written with real passion. I especially liked how it combines historical context, language analysis, and cryptographic ideas in a way that keeps the reader interested. It offers a bold and original perspective, and even for readers who are new to the Voynich Manuscript, it gives plenty to think about. A very worthwhile read for anyone who enjoys historical mysteries and unconventional scholarly work.

Jason Briscoe

This book really left a real impression on me, WOW! You can tell this book came from years of dedication, persistence, and belief in the work. That made it feel more personal than a lot of books I’ve read on difficult historical subjects.
I admired how much effort went into building the argument and presenting the material in a way that feels serious, thoughtful, and sincere. It takes courage to put forward an original idea on such a famous mystery, and I respect that.
What stayed with me most was the sense that this book was written by someone who truly cared about the subject and was willing to do the hard work rather than just recycle old opinions. That gave it a real sense of authenticity.
For anyone curious about the Voynich Manuscript, ancient codes, or historical mysteries, this is a very worthwhile read. I’m glad I read it, and I think it deserves attention.