"Frequently. I generally spend March, April, and May on the Continent—in France or Italy. But the house is never closed, and my people are responsible to me. The room is always locked, and when I am not in residence Abraham Masters, my butler, keeps the key. He shares my own feelings so far as the Grey Room is concerned."
The detective nodded. He was standing in the middle of the room with his hands in his pockets.
"A strange fact—the force of superstition," he said. "It seems to feed on night, where ghosts are involved. What, I suppose, credulous people call 'the powers of darkness.' But have you ever asked yourself why the spiritualists must work in the dark?"
"To simplify their operations, no doubt, and make it easier for the spirits."
"And themselves! But why is the night sacred to apparitions and supernatural phenomena generally?"
"Tradition associates them with those hours. Spiritualists say it is easier for spectres to appear in the dark by reason of their material composition. It is then that we find the most authentic accounts of their manifestations."
"Yes; because at that time human vitality is lowest and human reason weakest. Darkness itself has a curious and depressing effect on the minds of many people. I have won my advantage from that more than once. I once proved a very notorious crime by the crude expedient of impersonating the criminal's victim—a murdered woman—and appearing to him at night before a
