The Voynich Code: The World's Most Mysterious Manuscript(2010)

Original title: Das Voynich-Rätsel – Die geheimnisvollste Handschrift der Welt

It is the world's most mysterious manuscript. A book, written by an unknown author, illustrated with pictures that are as bizarre as they are puzzling - and written in a language that even the best cryptographers have been unable to decode.