The Argosy, Vol. 51, No. 4, April, 1891

Publishers in Ordinary to Her Majesty.
LONDON: PRINTED BY OGDEN, SMALE AND CO. LIMITED, GREAT SAFFRON HILL, E.C.

It must and shall be mine!
So spoke Captain Ducie on the spur of the moment as he wrote the last word of his translation of M. Platzoff's MS. And yet there was a keen sense of disappointment working within him. His blood had been at fever heat during the latter part of his task. Each fresh sentence of the cryptogram as he began to decipher it would, he hoped, before he reached the end of it, reveal to him the hiding-place of the great Diamond. Up to the very last sentence he had thus fondly deluded himself, only to find that the abrupt ending of the MS. left him still on the brink of the secret, and left him there without any clue by which he could advance a single step beyond that point. He was terribly disappointed, and the longer he brooded over the case the more entirely hopeless was the aspect it put on.
But there was an elasticity of mind about Captain Ducie that would not allow him to despair utterly for any length of time. In the course of a few days, as he began to recover from his first chagrin, he at the same time began to turn the affair of the Diamond over and over in his mind, now in one way, now in another, looking at it in this light and in that; trying to find the first faint indications of a clue which, judiciously followed up, might conduct him step by step to the heart of the mystery. Two questions naturally offered themselves for solution. First: Did Platzoff habitually carry the Diamond about his person? Second: Was it kept in some skilfully-devised hiding-place about the house? These were questions that could be answered only by time and observation.
So Captain Ducie went about Bon Repos like a man with half-a-dozen pairs of eyes, seeing, and not only seeing but noting, a hundred little things such as would never have been observed by him under ordinary circumstances. But when, at the end of a week, he came to sum up and classify his observations, and to consider what bearing they had upon the great mystery of the hiding-place of the Diamond, he found that they had no bearing upon it whatever; that for anything seen or heard by him the world might hold no such precious gem, and the Russian's letter to Signor Lampini might be nothing more than an elaborate hoax.