A new book is appearing this month:
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from one of the authors of:
The Voynich Manuscript: The Mysterious Code That Has Defied Interpretation for Centuries
The Voynich MS is discussed, but not going beyond a summary of this earlier book. According to the author, there are some new details related to the lives of Wilfrid and Ethel.
(Disclaimer: this is just for info. I have no personal interest in the sale of this book).