Was there any other means of exit from these grounds save that offered by the ordinary driveway?
He had an impression that in one of his strolls about, he had detected the outlines of a door in what looked like a high brick wall in the extreme rear.

If so, it were well worth his while to know where that door led.

Working his way along in the shadow cast by the house and afterward by the stable itself, he came upon what was certainly a wall and a wall with a door in it.

He could see the latter plainly from where he halted in the thick of the shadows.

The moonlight shone broadly on it, and he could detect the very shape and size of its lock.