So this was one way from the house into the upper chamber of the wall. Of course there was another way—that through which Runyon had been so abruptly precipitated. In order to find this the more readily, they sent the big rancher into the blue room and asked him to take the same position in the window he had on the night of his disappearance. This he did, pushing against the planking that boxed the window, with both elbows and with his back and shoulders, but without result. Finally, in his attempts, he inadvertently struck the opposite panel with his heel, and the response was startling. The panel, at his back, being released, fell backward without warning and for the second time Runyon tumbled unawares into the chamber of the wall. As soon as his body had fallen through, the panel slammed into place again, urged by a very powerful steel spring, but the major, who had been in the blue room to watch Runyon, had caught the trick and the mystery was solved.