tracks. And even if he had failed to superimpose any of his footprints, the parallel spoors would have been close together. But these two lines of prints were far apart: each clung to the extreme edge of the walk, as if the person who made them was positively afraid of overlapping. Now, consider the footprints made this morning. There was a single line of them entering the house, but none coming out. We concluded that the murderer had made his escape via the front door and down the neatly swept walk; but this, after all, was only an assumption."
Vance sipped his coffee and inhaled a moment on his cigarette.
"The point I'm trying to bring out is this: there is no proof whatever that all these footprints were not made by some one in the house who first went out and then returned for the express purpose of leading the police to believe that an outsider was guilty. And, on the other hand, there is evidence that the footprints actually did originate in the house; because if an outsider had made them he would have been at no pains to confuse the issue of their origin, since, in any event, they could not have been traced back farther than the street. Therefore, as a tentative starting-point, I assumed that the tracks had, in reality, been made by some one in the house.—I can't say, of course, whether or not my layman's logic adds lustre to the gladsome light of jurisprudence"
"Your reasoning is consistent as far as it goes," cut in Markham tartly. "But it is hardly complete enough to have led you directly to the linen-closet this morning."
"True. But there were various contribut'ry fac-
