Five seconds later a fleet apparition of a prevalent pinkish tone gave a ranging house cat the fright of its life as former darted past latter to vault nimbly up the stone steps of a certain weatherbeaten four-story-and-basement domicile. Set in the door jamb here was a vertical row of mail-slots, and likewise a vertical row of electric push buttons; these objects attesting to the fact that this house, once upon a time the home of a single family, had eventually undergone the transformation which in lower New York befalls so many of its kind, and had become a layer-like succession of light-housekeeping apartments, one apartment to a floor, and the caretaker in the basement. Since Bob Slack's bachelor quarters were on the topmost floor Bob Slack's push button would be the next to the lowermost of the battery of buttons. A chilled tremulous finger found that particular button and pressed it long and hard, released it, pressed it again and yet again. And in the interval following each period of pressing the finger's owner hearkened, all ears, for the answering click-click that would tell him the sleeper having been roused by the ringing had risen and pressed the master button that released the mechanism of the street door's lock. But no welcome clicking rewarded the expectant ringer. Assuredly Bob Slack must be the soundest sleeper in the known world. He who waited rang and rang and rerang. There was no response. Eventually conviction was forced upon Mr. Leary that he must awaken the caretaker--who, he seemed dimly to recall as a remembrance of past visits to Bob Slack, was a woman; and this done he must induce the caretaker to admit him to the inside of the house. Once within the building the refugee promised himself he would bring the slumberous Slack to consciousness if he had to beat down that individual's door doing it. He centred his attack upon the bottom push button of all. Directly, from almost beneath his feet, came the sound of an areaway window being unlatched, and a drowsy female somewhat crossly inquired to know who might be there and what might be wanted. "It's a gentleman calling on Mr. Slack," wheezed Mr. Leary with his head over the balusters. He was getting so very, very hoarse. "I've been ringing his bell, but I can't seem to get any answer." "A gentleman at this time o' night!" The tone was purely incredulous. "Yes; a close friend of Mr. Slack's," assured Mr. Leary, striving to put stress of urgency into his accents, and only succeeding in imparting an added hoarseness to his fast-failing vocal cords. "I'm his law partner, in fact. I must see him at once, please--it's very important, very pressing indeed." "Well, you can't be seein' him." "C-can't see him? What do you mean?"