"You see they saw the light," observed Burt. "I feared being traced here. After I left you this afternoon I noticed Jasper Bram's hired man watching me from a clump of trees. Later he passed the old mill here. He has told Bram and the officers." "Never mind. They won't get you just yet," Phil promised confidently. "Follow me quietly. You do your part, Andy." "Rest assured I will!" announced Andy, descending the stairs. As Phil and Burt passed him on their way to the rear of the place, Andy stepped on a big bench and pulled open a little window about ten feet from the ground. "Hey you!" he hailed to Bram, his son Greg and the officers outside, who poised a heavy tree log on their shoulders, ready to make a run for the door. "Come out of that!" shouted Jasper Bram, dropping his end of the impromptu battering ram and waving his arms excitedly up at Andy. "We've got you--oh, pshaw!" Here he recognized Andy. His face fell, while that of Andy broke into a tantalizing grin. "What's all this rumpus about, anyhow?" demanded Andy. "Don't let him fool you!" shouted Greg Bram to the officers. "It isn't so cozy in that old barn of a place that Andy Sabine would shut himself in. The other fellow is in there, too. Make him come out--make Andy tell." "See here, Andy Sabine," spoke up the town officer, trying to look and act dignified and important, "I suppose you know that it's a pretty serious offense obstructing the majesty of the law?" "Why, I am obstructing nothing," declared Andy innocently. "You be!" shouted old Bram. "You've shut us out. Come down and open that door, or it will be the worse for you." "I didn't lock the door. Huh! what have I got to do with your old door!" exclaimed Andy, in right royal indignation. "Well, the boy we're after did. You're harboring him. Do you know what harboring a criminal means in the eyes of the law, young man?" demanded the town officer. "Bosh!" cried down Andy, "get in the best way you can. I'm not around opening doors for people." Andy shut the window with a slam, for he had parleyed with and delayed the enemy to some purpose. Of this Andy was apprised by a low whistle sounding from a distant part of the structure. It was an agreed signal with Phil Warrington, and Andy now felt very independent and fearless. Meantime Phil had led Burt Noble to a lower floor of the old mill, in pursuance with a suggestion of the clever and quick-witted Andy. Phil had been in the building several times since his arrival in Concord during the desultory rambling excursions along the river, and what he did not know about the place Andy had told him. A section of the building reached out over the water. Its floor at this place was covered with a movable wooden grating. There was still light enough, as the boys reached this, for Phil and his companion to discover outlines. Phil pulled the grating up and tilted it against the side of the room. "Now then, Burt Noble," he said briskly, "can you swim?"