It is not without a certain emotion that I begin to recount here the extraordinary adventures of Joseph Rouletabille. Down to the present time he had so firmly opposed my doing it that I had come to despair of ever publishing the most curious of police stories of the past fifteen years. I had even imagined that the public would never know the whole truth of the prodigious case known as that of “The Yellow Room,” out of which grew so many mysterious, cruel, and sensational dramas, with which my friend was so closely mixed up, if, à propos of a recent nomination of the illustrious Stangerson to the grade of grand-cross of the Legion of Honour, an evening journal—in an article, miserable for its ignorance, or audacious for its perfidy—had not resuscitated a terrible adventure of which Joseph Rouletabille had told me he wished to be for ever forgotten.

“The Yellow Room!” Who now remembers this affair which caused so much ink to flow fifteen years ago? Events are so quickly forgotten in Paris. Has not the very name of the Nayves trial and the tragic history of the death of little Menaldo passed out of mind? And yet the public attention was so deeply interested in the details of the trial that the occurrence of a ministerial crisis was completely unnoticed at the time. Now “The Yellow Room” trial, which preceded that of the Nayves by some years, made far more noise. The entire world hung for months over this obscure problem—the most obscure, it seems to me, that has ever challenged the perspicacity of our police or taxed the conscience of our judges. The solution of the problem baffled everybody who tried to find it. It was like a dramatic rebus with which old Europe and new America alike became fascinated. That is, in truth—I am permitted to say, because there cannot be any author’s vanity in all this, since I do nothing more than transcribe facts on which an exceptional documentation enables me to throw a new light—that is because, in truth, I do not know that, in the domain of reality or imagination, one can discover or recall to mind anything comparable, in its mystery, with the natural mystery of “The Yellow Room.”