The pathway sloped downward and then took a sharp turn.

As Cabot passed this the light behind him was extinguished as suddenly as it had appeared, the wild music sounded louder than ever, and directly in front of him gleamed two squares of light like windows.

Between them was a dark space, towards which he instinctively stumbled.

It proved to be as he had hoped, a door massive and without any means of unclosing that his blind fumblings could discover.

So he beat against it feebly and uttered a hoarse cry for help.