By one of those extraordinary coincidences by which the simple course of ordinary events so often baffles the best laid schemes of crime, there were others in the house, besides the young man Aldridge, who witnessed the movements of the Baron and Madame R**. It so happened that, on the afternoon of that particular day, the woman of the house had hampered the little latch-lock by which young Aldridge usually admitted himself, and, as this occurred late in the day, it is more than probable that the Baron was unaware of it, as also of the fact that in consequence the servant-girl Susan Turner, sat up beyond the usual hour of going to bed for the purpose of letting the young man in. This girl, it seems, had a lover--a stoker on one of the northern lines--and him she appears to have invited to keep her company on her watch. Aldridge returned and went up to bed, but the lover--who was to be on duty with his engine at two o'clock, and who was doubtlessly interrupted in a most interesting conversation by the arrival of the lodger--still remained in the kitchen, and was only just leaving it when Madame R** came down stairs. Taking her at first to be the mistress of, the house, and fearful lest the street-lamp gleaming through the glass partition should betray her "young man's" presence, Susan Turner draws him to the lumber-room, the window of which, it appears, looks into a sort of well between the house and the two rooms built out at the back, after a fashion not unusual in London houses. Into this well, also, immediately opposite to the window of the lumber-room, looks that of the backroom or laboratory, furnished with what the witness describes as a "tin looking-glass," but which is really one of those metal reflectors, in common use, for increasing the light of rooms in such a position. The distance between the two windows is little more than eight feet. The night was clear, with a bright, full harvest moon, and its rays, thrown by the reflector into the laboratory, made every part of its interior distinctly visible from the lumber-room. The door of the latter room was open, and the staircase illuminated by the Baron's approaching light. The hiders in the lumber-room could see distinctly the whole proceedings of both Baron and Madame R**, from the time Aldridge lost sight of them to the moment they again emerged into his view. And this was what they saw: _"Madame R** never went into the kitchen at all;" "she went straight into the laboratory," and "the Baron watched her as she came out."_ A glance at the place will show the bearing of this evidence and the impossibility of the Baron (who, if he had not been in the kitchen, must at least have thoroughly known the position of his own laboratory) having made any mistake on this point. What, then, was his motive in thus imposing upon Aldridge, to whose interference he professed himself so much indebted, with this false statement of the place to which Madame R** had been?