There is a book. It is about two finger-widths thick, its cover is worn, and dense handwriting runs across roughly 240 pages. At a glance it looks like an ordinary medieval European manuscript, the kind that might have turned up anywhere. And yet everyone who opens it runs into the same wall, without exception: they cannot read a single word. The book is written in no known language and in no known script. On page after page there are illustrations of plants that do not exist in nature, circular diagrams that look like star charts, and small naked women submerged in pools of green water, linked by strange tubes. The greatest cryptographers of the twentieth century attacked it. Military codebreakers who cracked enemy ciphers during the Second World War took it on. Recently, even artificial intelligence has been thrown at it. And yet, after six hundred years, no one knows what this book says. Held by Yale University's Beinecke Rare Book and Manuscript Library under the shelf mark "MS 408," it is called the Voynich Manuscript, and it is widely known as the most mysterious book in the world.
A Real Book, and Yet an Unreadable One
First, one thing must be made clear. The Voynich Manuscript is not an urban legend or an internet ghost story; it is a physical object you can actually touch. At this very moment it sits in the vault of the Beinecke Rare Book and Manuscript Library at Yale University in New Haven, Connecticut. Its entire contents have been digitized in high resolution and made freely available online, so anyone can page through this strange book with their own eyes.
When it was made is known with relative precision. In 2009, researchers at the University of Arizona removed fragments of the manuscript's vellum and subjected them to radiocarbon dating. The results were consistent across every sample tested, pointing to a date between 1404 and 1438. In other words, the calfskin vellum that forms the book was prepared in the early fifteenth century. This finding matters a great deal. For a long time there was suspicion that the book might be an elaborate later forgery, but once the vellum itself was confirmed to be six hundred years old, the theory of a post-medieval fabrication was effectively ruled out. The book measures roughly 16 by 23 centimeters. It is estimated to have originally held around 272 pages, of which about 240 survive. The vellum is unusually soft and heavily thumbed, which suggests this was not a decorative object but a working book that someone actually turned to again and again.
A Script That Does Not Exist, a Language No One Knows
At its heart, the mystery of this book comes down to its letters. The script that fills the manuscript is commonly called "Voynichese," but that is not the name of a recognized language; it is simply a nickname for the unidentified writing found in this book. It matches no known writing system: not the Latin alphabet, not Greek, not Arabic or Hebrew, not Chinese characters, nor any other. Scholars count roughly twenty to twenty-five primary characters, written left to right in a smooth, flowing hand. The penmanship itself is confident and unhesitating, giving the impression that whoever wrote it was completely fluent in this script.
More intriguing still is that, statistically, this unidentified text is not the same as meaningless gibberish thrown together at random. The whole runs to about 38,000 words, of which roughly 9,000 are distinct word types. Certain words appear more often in certain positions, and the distribution of word lengths follows patterns similar to those of natural languages. Several analyses have argued that these statistical features resemble the structure of a real language. So is this a lost tongue? An elaborately enciphered Latin or another European language? Or an invented, constructed language made from scratch? That question itself has gone unanswered for more than a century.
The Strange Illustrations — Plants That Don't Exist, Turning Stars, Submerged Women
Since the writing cannot be read, people naturally cling to the pictures. The manuscript divides into roughly six sections according to the nature of its illustrations. The largest is the "herbal" section. Across 126 pages, all manner of plants are drawn in detail, roots and leaves and flowers alike, and the problem is that none of them clearly matches any real plant on Earth. The pages are filled with imaginary plants that look as if the parts of several different species had been stitched together.
The "astronomical" section that follows contains circular diagrams reminiscent of the twelve signs of the zodiac, while the "cosmological" section turns with complex circular medallions whose meaning is unknown. And what many consider the strangest part of the book is the "biological," or balneological, section. Across about twenty pages, small naked women appear again and again, immersed in tubs and structures through which a greenish liquid seems to flow. Whether this represents the medical and anatomical knowledge of the time, some form of spa or bathing therapy, or something else entirely remains a puzzle. Finally come a "pharmaceutical" section, lined with herbs and vessels, and a "recipes" section whose entries are separated by star-shaped marks. The drawings in each section seem to reach toward some systematic body of knowledge, yet because the accompanying text cannot be read, the meaning of the images is never settled either.
Who Made This Book, and Why?
The book's ownership can be traced in fragments from around the seventeenth century onward. The broad thread of the confirmed story runs like this. Rudolf II, Holy Roman Emperor, is said to have bought the book for the large sum of 600 gold ducats, and he has long been named as its first confirmed owner. The book then passed into the hands of the Prague alchemist Georg Baresch, whose 1639 letter to the celebrated Jesuit scholar Athanasius Kircher in Rome survives as the earliest firm record concerning the manuscript. Baresch, unable to make any sense of the book, wrote to Kircher, renowned in his day as a master of languages and ciphers, begging him to uncover its secrets.
After Baresch's death, the book passed to Jan Marek Marci, rector of Charles University in Prague, who sent it on to Kircher around 1665. The letter Marci enclosed makes for intriguing reading. He relayed a rumor that the book's author might have been Roger Bacon, the thirteenth-century English scholar, while stating plainly that he himself suspended judgment on the matter. The book later spent a long time in Italy in Jesuit hands, until in 1912 the Polish-born antiquarian book dealer Wilfrid Voynich acquired it from a Jesuit college near Frascati, and it finally became widely known to the world. The name by which the book is called today comes from his surname. Yet for all this chain of ownership, there is no firm answer at all to the most basic question: who first wrote this book in the early fifteenth century.
The Finest Codebreakers All Failed
In the twentieth century the Voynich Manuscript became a legendary problem in the history of cryptanalysis, and the roster of those who tried is a distinguished one. William Friedman, the legendary cryptologist of the U.S. National Security Agency, and his wife Elizebeth Friedman; John Tiltman, a British Army cipher expert active during the Second World War; Prescott Currier, a U.S. Navy linguist — the very people who had unraveled the enemy's most sophisticated wartime ciphers threw themselves at this book. Friedman studied the manuscript for decades, yet the conclusion he ultimately reached was simply that he could not crack it. The most he offered was a cautious suggestion that the text might perhaps be an artificial, constructed language.
As the eras changed, so did the tools. When computers arrived, statistical analysis and computational linguistics were brought to bear, and eventually even artificial intelligence took a turn at this ancient riddle. In 2018 a study by researchers at the University of Alberta in Canada, using natural language processing techniques, made headlines by proposing that the underlying language of the text might be medieval Hebrew. But the researchers themselves acknowledged that the result was not a definitive decipherment, only a "starting point," and might well be an artifact of the combinatorial power of their algorithms. No matter how advanced the tools grew, the fundamental wall remained: there was no "answer key" against which any result could be verified.
The Claims of a Solution, and the Rebuttals
Over six hundred years, claims that the code had "finally been cracked" have appeared countless times, several of them drawing heavy press attention. In 2019, a researcher at the University of Bristol in England announced that the book was written in a lost "proto-Romance" language, a reference work compiling information on herbal remedies, therapeutic bathing, and astronomy, compiled by Dominican nuns. That claim was quickly rebutted, criticized by scholars and linguists as lacking a sound basis. Others have proposed that the book is in fact an elaborate forgery — an artful hoax dressing up empty nonsense to look meaningful — or that it is written in some particular ancient language or dialect. Interpretations have piled up over the years.
One point must be emphasized here. Not a single one of the "successful decipherment" claims made to date has passed independent academic verification. Even when an individual researcher announces a plausible reading of a few words or sentences, if that method cannot be applied consistently across the whole book so that other researchers reproduce the same result, it is not recognized as a verified decipherment. The Voynich Manuscript has never once cleared this threshold. Flashy headlines have appeared again and again, but the official position of the scholarly world, including Yale's own library, has always been the same: the book has not been deciphered.
Why Is It Still a Mystery?
Perhaps the reason this book has remained a mystery for six hundred years is that the gap between what we know for certain about it and what we do not know is simply too wide. We know it was made in the early fifteenth century. We know it was written in real ink on real vellum, and that it is an object someone actually turned to over a long time. We even know that the letters follow certain rules and structures, and that the pictures seem to deal with plants, the heavens, and the human body. And yet, before the most important thing of all — what these letters mean, and who made this book and for what purpose — we can still say nothing.
It has not even been settled whether the book is an enciphered natural language, a text written in some lost tongue, or an elaborate shell with no meaning at all from the start. In the space that the finest human cryptographers and the latest artificial intelligence have all backed away from, this ancient vellum still keeps its silence. Perhaps one day a decisive clue will surface and the first sentence of this book will finally be read aloud. But at this moment, the Voynich Manuscript remains what it has always been: the most mysterious book in the world, one that humankind has held in its hands and still cannot read.
