It was a small room, this back room, where, no doubt, Mr. Mill, when he was at home, was accustomed to smoke his pipe and attend to his correspondence. Two of the walls were lined with bookshelves; one side was taken up by the window; and on the fourth, opposite the door and above the fire-place, were hung a quantity of mezzotints framed in sombre black. They surrounded a small oil painting that filled the place of honour immediately over the chimney piece, and which caught Gimblet’s interested eye directly. It appeared to be an example of the early Dutch school, and he was seized with the desire to examine it more closely. The fire-place below it was lined with old blue and white tiles, and at these too he cast an envious glance, but the feelings of the collector were subservient just now to those of the detective, and he turned to the more everyday furniture of the room.
There was not very much in it: a couple of arm-chairs stood one on each side of the fire-place, and before the window was a large writing table with inkstand and blotting book disposed upon it, together with a few odds and ends. Even with these the table looked empty; one missed the papers that by rights should have been scattered there. As Gimblet stood beside it, he was conscious of the cold draught that whistled by his ear, and it was then that he first looked toward the window.
“It must be open,” he said to himself, and then, as he looked closer: “By Jingo!”
It was a sash window of the old-fashioned kind, with a dozen or so wood-framed panes to each half of it, and the usual metal catch holding the top and bottom in position together when the window was shut. It was shut now, and the cold air that pervaded the place entered through cracks in the shutters, and after that encountered no further obstacle, for the top middle pane of the lower sash was destitute of glass.
Gimblet pushed away the table and examined the empty framework carefully, touching the edges with an incautious finger, which, however, he withdrew rather hurriedly and transferred to his mouth. He looked at the floor; and then, following his usual custom, knelt down on it, lens in hand. The gaslight was obscured by the shadow of the writing table, and he had recourse to the aid of a pocket electric torch. He was satisfied with what he saw, apparently, for he soon rose and turned to the window again. He unfastened the catch, and placing one hand on the framework sought to raise the sash, but it stuck stiffly, and both hands and a good deal of strength had to be exerted before he was able to lift it.
Then he flashed the light of the little torch on the window sill, and took from it a splinter of broken glass. After this he pursued his inspection of the room and its contents. There was, as has been said, little enough in it except books, but everything there was came in for the usual close scrutiny; the waste paper basket was not forgotten, nor were the empty grate and coal scuttle. In the end, after comparing the things mentioned in the inventory with those in the room, Gimblet shut the door into the hall, and ran his lens hastily over its woodwork. Apparently he saw on it more than he expected, for he returned more slowly to the task and spent several minutes examining some small spots of dirt, which were visible to the naked eye on the white paint.
At last he had done, and there only remained the basement to be investigated. This took some time, and the results disappointed him, with the exception of a cupboard under the stairs where he discovered a housemaid’s dustpan full of pieces of broken glass. He seized on it with eager excitement, and examined the surface of the tin very carefully with his lens; only to put it down again with an irritated clicking of the tongue.
Sir Gregory watched these proceedings in a stricken silence; his hopes had turned to lead at the words Gimblet had addressed to him on leaving the drawing room; as each successive door was thrown open he felt a tightening of the heart and a sick fear of being confronted with some terrible sight. Now he would almost have preferred that the detective should find no clue, so much he dreaded the solution to which he instinctively felt that these small discoveries were irresistibly leading.
The face of the clerk, who equally shared the rôle of silent onlooker, wore an expression of excited interest, except when he was addressed, when it relaxed into its usual wooden apathy. At other times he peered over Sir Gregory’s shoulder with feverish, straining eyes, evidently possessed by all the passion for sensation in any form which is common to his class; though, that he was as much in the dark as Sir Gregory, with regard to the conclusions suggested to the detective by the various objects he examined, was clear from the look of something like elation with which he watched the minute attention bestowed upon the unprofitable dustpan.