Chapter 30

“‘If your friends have been ghost-hunting,’ the man said, ‘I fear they’ve found a very substantial one. My wife and I were out for an early morning stroll, when we suddenly saw the upheaval in the lake. And if you will look down that passage’—he pointed through the opening—‘you will see the water. I fear that your friends must have inadvertently found a most dangerous piece of mechanism, which I have heard of often but never believed to be really existent. Nothing more nor less, in fact, than a diabolical arrangeme…