“Don’t think I’m cracked, Professor,” he said. “I’m not. But it takes me that way now and then. It’s the Irish in me. And, believe it or not, I’m telling you the truth.”

I looked eastward where the moon, now nearly a week past the full, was mounting.

“You can’t make me see what you’ve seen, Lieutenant,” I laughed. “But you can make me hear. I’ve always wondered what kind of a noise a disembodied spirit could make without any vocal cords or breath or any other earthly sound-producing mechanism. How does the banshee sound?”

O’Keefe looked at me seriously.