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An intense hunt is underway for the crystal cork of a carafe - an ordinary cork. Not only Arsène Lupin, known as the "noble robber", but also a mysterious lady with a child and, finally, many different worthies of the Third Republic are hunting for it.
It is noteworthy that the owner of the precious cork does not hide - he is always in sight, but the goal is still unattainable. What kind of secret is hidden in this cork and will Arsène Lupin, who knows no defeat, be able to take possession of it?

Another action-packed story from Maurice LeBlanc resembles a dense weave of riddles and mysteries that readers willingly undertake to solve together with the characters. And it is not surprising, because the author is a true master of avoiding direct answers and hiding the whole picture of events in the bizarre garb of hints and nuances, and the main character himself is too fanciful... and just as no one knows Lupin's true face, getting lost in the features of all kinds of representatives of high and low society, so until the end of the book the reader often does not suspect how it will end and what the crown of the intrigue is.

"The Crystal Crust" (1912) will also not leave anyone indifferent, creating a world in which a discerning reader, and not only detectives, is ready to look for light at the end of a long tunnel...