He pulled it aside and put it down upon the floor, and then turning his attention to the space that he had uncovered he immediately saw where there was a hole the size of a lead pencil, through the steel that had been covered by that section of the frame that he had just removed.

A glance at the section of the frame itself revealed a small steel rod which was in the exact place where it would have fitted through the hole when the frame was in place, and at the outside of the frame it was fastened to a section of the ornamental part of it, so that if Nick had but known where to place his thumb a few moments sooner, it would have been unnecessary to have gone to all that trouble.

With the hammer he drove the small steel rod out of the frame, took it in his hand, inserted it in the hole, and pressed solidly upon it.

At once there was a sharp click from beyond the wall, and the whole picture moved outward the distance of a quarter of an inch, and stopped.

Nick put his fingers into the opening, and pulled, and the steel plate across which the canvas had been stretched responded to his effort.

It moved outward into the room on silent hinges, forming a perfect doorway, and it revealed—well, just what he had been seeking; more explicit description seems unnecessary just now.

To add to the possibilities of the secret entrance, its approach, the necessary stairs, and its general utility, a false chimney had been added to the construction of the house at just that point.

That, added to the thickness of the wall itself, afforded ample space for the object in view when the place was constructed, and it added to the general symmetry of the proportions of the building, also.

In the space into which the three men gazed, and which was at least four feet by six, and from one of which a spiral staircase descended, there were two chairs. There was also an incandescent electric bulb brilliantly alight; and there were also many stumps of handmade cigarettes, burnt matches, and sprinklings of tobacco on the stone floor.

“Red Mike evidently waited for Madge right here while she entered the room,� was the comment of the detective, as he gazed upon these things.