"You see, there would be a motive for the murder."

"The thing is to find Mrs. Harrison," she said. "A woman doesn't go away in the middle of the night unless she has a good reason for doing so."

Details of the crime, so far as they were known, were now published, and the description of Mrs. Harrison was circulated in the press.

When the inquest was adjourned, no doubt most people were surprised.

Although I did not suppose the companion innocent, I was not satisfied that she alone was responsible for the crime. I had wondered whether the letter which I had seen in Jardine's flat had come from her, but the store's order which Martha Wakeling had given me proved that I was wrong. Possibly Mrs. Harrison was a member of the gang which Mrs.

Jardine had forsaken, and the murder was one of revenge; yet Thomas Jardine profited so greatly that I could not dismiss him from my calculations. Besides, the old lady's will was suggestive. Over her husband's money she had no control, but she had saved a considerable amount, and, as though to make rest.i.tution to her husband's family, but with a curious reservation--only if she died a natural death.

Should she die by violence or accident, this money went to her "faithful servant and friend, Martha Wakeling." It was evident she had feared violence--apparently from her nephew--and it was significant that her papers proved that, although Jardine knew he was her heir, he was not aware of the condition.

Before the day fixed for the hearing of the adjourned inquest I went to see Christopher Quarles.

I had nearly finished the story before he showed any interest, and then we went to the empty room, with Zena with us, where I had to tell the tale all over again. He had to have his own way, or there was nothing to be got out of him at all.

"Was there no information to be had from Sarah Paget?" he asked, when I had finished.

"None whatever."

"Did Mrs. Jardine keep much money in the house?"

"Martha Wakeling says not."

"Then the companion was likely to get little by murdering her mistress," said Quarles.

"Either she did it in a fit of uncontrollable pa.s.sion," I said, "or the motive was revenge."

"Possible solutions," returned the professor, "but robbed of their weight when we consider the motives which Thomas Jardine and Martha Wakeling had."

"I think----"

"One moment, Wigan; I am not theorizing, I am using facts. By murdering his aunt, Jardine lost her money----"

"He inherited three or four thousand a year," I interrupted.

"Which was mortgaged up to the hilt or over it; he told you so himself. Mrs. Jardine's money would have been very useful to him, and by killing her he would lose all chance of it."

"He did not know the condition," I said.

"So far as we know," Quarles answered. "I don't think we must consider that point as proved. Now take Martha Wakeling's position. By the violent death of her mistress she will come into this money. Was there any provision for her in the will if Mrs. Jardine died a natural death?"

"She got a legacy of a hundred pounds."

"You appreciate the enormous difference," said Quarles with that exasperating smile he had when he thinks he has driven his opponent into a corner.

"At any rate, we have no reason to suppose that Jardine did know the condition," I returned. "I do not believe he committed the murder, but I am inclined to think he and Mrs. Harrison are accomplices."

"A theory--my method, Wigan. Very good, but by the handwriting on that envelope you have tried to establish a connection between Jardine and Mrs. Harrison, and have failed."

"At present," I said irritably.

"It is a pity that some of the old superst.i.tions do not hold good,"

said Quarles, "or at least are without significance in these practical days. You might have confronted Jardine with his victim, and the wounds might have given evidence by bleeding afresh. I suppose you haven't done this?"

"No, Jardine has not seen his aunt," I answered, still irritably.

The professor looked at Zena.

"It is curious the tragedy should happen while Dr. Hawes was away,"

Zena said. "What kind of man is his loc.u.m, Mr. Wigan?"

"Quite above suspicion," I answered.

"Ah, your question sets me theorizing, Zena," said Quarles, "and we have got to watch Martha Wakeling, Wigan. Yes, I am going to help you, and we'll start to-morrow morning."

We returned to the dining-room, and after a pleasant hour, during which we appeared to forget that such a place as Wimbledon existed, I left, far more of a lover than a detective.

Next morning Quarles called for me.

"We'll go to the stores first," he said. "I have a fancy to look at the items in the list sent. There might be some drug which would make Mrs. Jardine sleep more soundly."

"The list was not sent. I have it here."

"I mean the one sent in place of that," said the professor. "Of course one was sent. People who are not in the habit of having much money in the house would see that the store cupboard was replenished."

He was right. A list was shown to us, and I had some difficulty in not showing signs of excitement. The writing was the same as that on the envelope in Jardine's flat. It was peculiar writing, and I could swear to it.

"I think we shall find that Martha Wakeling wrote that," said Quarles.

"If so, we establish a link between her and Jardine which neither of them has mentioned."

"But since she would profit by the crime, why should she communicate with him?"

"We are going to find out," he answered. "I presume you have not been keeping any particular watch upon Martha Wakeling?"

"No."

"Has she mentioned what she intends to do when this affair is over?"

"I think she said she would go back to her old village somewhere in Ess.e.x."

"Quite a rich woman, eh?" laughed Quarles. "But I doubt the statement about her old village. She is more likely to go where she is not known."

"You will change your opinion when you have talked to her."

"I hope to know all about her before I talk to her," Quarles returned. "We are going to Wimbledon, but not to an interview yet."

Arriving there, I went to the house to make sure that Martha Wakeling was there, and then, taking care not to be seen, joined the professor in the garden, where we hid in a shrubbery to watch anyone who came from or went to the house. It was a long wait--indeed, Quarles was rather doubtful whether anything would happen that day--but in the afternoon Martha Wakeling came out and pa.s.sed into the road.