Dan Peterson was among these last. A good, able-minded detective, though not of the transcendental type found in story-books, he worked diligently at his problem, which seemed to him a harder one than he had ever before tackled.

His suspicions were all toward the servants of the house, and with these he included Elijah Stebbins.

Nor was he illogical in his thoughts. Stebbins was acting queerly. He was frightened at questions, and was difficult to get hold of for an interview. He answered at random, frequently contradicted himself, and showed a positive terror of his own house, since the tragedies there.

“If he killed those two people with his own hands, he couldn’t act any different,” Peterson said to Landon, whom he frequently consulted. “But I can’t imagine any way to connect him up with it. He was home in East Dryden when they died, and that’s certain. Now, if he could have made old Thorpe act as his tool—but, Lord, why would he do it, anyhow! It’s too absurd to think Stebbins would want to take those two lives! He wanted you people should be scared, that I’m sure of. He did all he could to scare you,—that I know. But as to killing any of you, I’m sure he didn’t. Howsumever, somebody committed those murders, and I’m going to find out who!”

CHAPTER XII
The Professor’s Experience

But the days passed by, and Dan Peterson was unable to make good his word. Everybody, outside of the immediate household at Black Aspens believed the two mysterious deaths were the result of the murderous intent of one or more human beings, and refused absolutely to consider the spook nonsense offered in explanation by the friends and relatives of the victims.

Meanwhile there were a few further inexplicable happenings in the old house. Now and then, one or another would notice the odour of prussic acid, or would report a glimpse of a ghostly figure prowling round at night, or tell of hearing low moans at four o’clock in the morning.

But, usually, these were the experiences of only one, and lacking corroboration, could be set down to imagination, which was now especially vivid in all the party. Often Eve or Norma recounted some of these mysteries, but Landon laughed at them and said the girls had been dreaming.

Professor Hardwick experienced no similar illusions, though he longed to do so. Indeed, he really watched and listened, hoping for some message or manifestation from his friend, Gifford Bruce. But none was vouchsafed to him, and though interested in the experiences of the others, he still longed for a personal experience.

And finally one came to him.