THE MYSTERY OF THE YELLOW ROOM
murderer entered the pavilion he already possessed the brass-headed key."
"That is impossible," said Monsieur Stangerson in a low voice.
"It is quite possible, Monsieur, as this proves."
And the young rascal drew a copy of the "Epoque" from his pocket, dated the 21st of October (I recall the fact that the crime was committed on the night between the 24th and 25th), and showing usan advertisement, he read:—
"'Yesterday a black satin reticule was lost in the Grands Magasins de la Louvre. It contained, amongst other things, a small key with a brass head. A handsome reward will be given to the person who has found it. This person must write, poste restante, bureau 40, to this address: M. A. T. H. S. N.' Do not these letters suggest Mademoiselle Stangerson?" continued the reporter. "The 'key with a brass head'—is not this the key? I always read advertisements. In my business, as in yours, Monsieur, one should always read the personals.' They are often the keys to intrigues, that are not always brass-headed, but which are none the less interesting. This advertisement interested me specially; the woman of the key surrounded it with a kind of mystery. Evidently she valued the key, since she promised a big reward for its restoration! And I thought on these six letters: M. A. T. H. S. N. The first four at once pointed to a Christian name; evidently I said Math is Mathilde. But I could make nothing of the two last letters. So I threw the journal aside and occupied myself with other matters.
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