"I don't know. I haven't had a line from him since he went away, but
the sum I have received for him in rent doesn't amount to much, I can
tell you."

I expected to find the professor rather ill-tempered at my interference,
but I found him inclined to raillery.

"Are you hunting a murderer or a ghost, Wigan?" he asked.

"I am not quite sure, but I think at the back of my mind there is an idea
to keep you out of the clutches of the subtle personality of whom you are
afraid. Come up to the haunted room; we will talk there, but it must be
in whispers. If I have had any success it is believed that you are in
this house alone to-night."

"A foolish old man alone, eh?"

"In this instance I am inclined to answer yes."

"You are quite right to say exactly what you think," he returned.

"Have you considered the possibility that some one is trading on your
known enthusiasm for psychological research?" I asked.

"Surely you do not mean Randall?"

"No, but he may have been used as a tool. Frankly now, would you have
undertaken this business just at the present time had it not been for
Dr. Randall?"