And Estrella De Vere, the Female Detective, with Sherlock Holmes on one side and Vidocq on the other, passed down the path.

Ten minutes later Dick came out of School Hall and stood for a minute on the porch, looking idly about him. The snow which had covered the campus a foot deep a fortnight before was almost gone, and in places the sere brown turf showed through the worn and tattered coverlid of white. It was quite warm to-day, with a muggy atmosphere and a leaden sky, almost too warm for snow, and yet feeling very much like it. There was a steady drip, drip from the eaves and ledges, and the walks were showing borders of trickling water. Dick frowned and looked anxiously into the sky. What he saw there seemed to please him but little, for the frown deepened.

“Two or three days of this sort of weather,” he muttered half aloud, “and the ice won’t be worth a cent.”

Then, looking carefully about him again, he went down the steps and turned to the right toward Burgess. There were several boys in sight, but, and this was suspicious, neither Chub, Roy, nor Harry was to be seen. He took his books into the study room and deposited them on the big table. Then, the room being deserted, he crossed to one of the end windows and looked stealthily out. Apparently the coast was clear. But he was taking no chances, and so he stole around to a front window and viewed the prospect carefully from there. He seemed puzzled, for he thrust his hands into his pockets, stared steadily for a whole minute at the engraving of “Washington Crossing the Delaware,” which adorned the wall above the fireplace, and whistled softly to himself. Then, having apparently decided upon a course of action, he left the study room, crossed the corridor and opened a door which gave on to a descending stairway leading to the cellar. Down this he went very quietly, reached the furnace room and from there gained the outer air by way of a flight of stone steps. He was in a small stone-paved court behind the building, with the hedge marking inner bounds but a few paces away. There was a gate here, and making his way between a double row of ash barrels he passed through it and plunged into the Grove. Then he turned to the right and wound between the trees, crossing the path to the boat-house and river at right angles, and keeping well out of sight of the windows of the halls. Five minutes of this brought him to the corner of the hedge. Here the trees ceased abruptly and gave way to snow-covered fields. Crouching behind the hedge so that his head was below the top of it, he followed it at right angles to his first course until opposite the barn and stables. Here he raised his head and reconnoitered. There was no one in sight and presently he was wriggling his way through a hole in the hedge. From there he passed around the back of the small stable and fetched up before a small door leading to the basement of the barn. That door required careful handling, for it hung only by one leather hinge. But Dick managed to get through it, displaying a certain degree of familiarity with its idiosyncrasies, and closed it behind him.

He found himself in total darkness, but without hesitation he crossed the earthen floor and climbed a narrow flight of steps. As he went upward the darkness gave way to gray twilight and when he reached the main floor of the barn behind the cow stalls it was light enough to allow him to see distinctly about him. So far he had made scarcely a sound since entering the building, and now he crept very quietly along until he could see the closed door. The barn was deserted save for the inmates of the boxes across the bare floor, and even they were so quiet that no one would have suspected their presence. Dick gave a sigh of relief and walked less stealthily to the back of the barn where a ladder led straight upward to the edge of the loft. He sprang nimbly onto it and ascended until he could crawl over the edge of the upper flooring.

In front of him was a space some thirty feet broad by twenty deep. On one side it was used as a storage place for a couple of old sleighs, the remnants of a windmill and similar discarded truck. On the other side the remains of last summer’s hay was stowed in a mow which ran along over the cow stalls. In the center of the loft, under the small window, was a large packing-box and beside it was a small one. On the larger one were spread several sheets of brown paper, pencils, a square, a rule, a pair of dividers and other tools of the draftsman. There was a good light from the window, in spite of the fact that its four small panes were obscured with dust and spider webs.

Dick went to his improvised table, took up a piece of kneaded rubber which lay there, and played with it while he studied the top sheet of paper. It was pretty well covered with lines and figures, but only the designer knew what they stood for. After a moment he drew the small box up and sat down on it, discarded the eraser for pencil and rule and set to work.

It was very quiet in the barn. Now and then Methuselah moved in his cage and muttered unintelligibly or a bat squeaked somewhere overhead in the darkness. Soon Dick was quite oblivious to everything save the work before him. He drew lines with his pencil, used ruler and dividers, set down figures on a smaller sheet of paper and multiplied or added or subtracted, erased lines already drawn, and through it all wore a deep frown which told how wholly absorbed he was in the task. And so he didn’t hear the soft rustlings which came from the top of the haymow a few feet away when three heads were thrust into view. Heard nothing, in fact, until the silence was suddenly shattered by a sudden [“AH, THERE!”]