When Roper was dismissed from the Institute he wrote to Philpot asking if he could help him towards getting another job, and it was while thinking over this request that the first idea of the crime entered the doctor’s mind. His plan was if possible to get Averill to dismiss his servants and to employ the Ropers in their places. Then he intended to get the couple to join with him in the murder of Averill and the theft of his money.

At first Philpot’s only idea was to obtain as firm a hold over the Ropers as they had over him, so as to free himself not only from the serious financial drain of their blackmail, but also from the terrible haunting fear that sooner or later they would betray him. But further consideration showed him a way by which he could get enormously more than this. By it not only would he achieve absolute safety in connection with his wife’s death, but the whole of Averill’s wealth might be his. It was no doubt a very terrible plan, for it involved committing two other murders, but fear and greed had by this time rendered Philpot almost inhuman and he cared for nothing but his own welfare. By this plan both the Ropers were to be done to death in such a way that suspicion could not possibly fall on himself. Even suspicion that a crime had been committed at all was unlikely, but if this by some unforeseen circumstance were aroused, it would certainly be believed that Roper had not died, but had committed the crime himself. After careful thought Philpot decided to put his plan into operation.

First, he sent Roper a note to meet him at a secluded point on Arthur’s Seat, Edinburgh, and there he put up his proposal. Roper listened eagerly and accepted with alacrity. But in the course of conversation he made an admission and suggested a modification which amazed the doctor, but which, as it fell in with the latter’s secret plan, he agreed to after some show of objection. Roper, it appeared, had also made a mistake in his marriage. He had also grown to hate his wife and would go to any lengths to regain his freedom. In the light of the doctor’s proposal he saw his chance. Old Averill was to be murdered and to cover up the crime an accident was to be staged. Very well: Mrs. Roper could be got rid of at the same time. The same accident would account for both deaths. The two men discussed the ghastly details, and by the time they parted the whole hideous affair was cut and dry. Briefly, the plan was as follows:—

Roper should first arrange his getaway, and while still living at Kintilloch should apply for a passport for Brazil. Inquiries about him would come to the local police, who would certify that he was the original of the photograph enclosed and that the matter was in order. Roper would drop a hint that he had a brother in Santos whom he had often thought of joining, a course which he proposed to follow now that he had left the Ransome. On receipt of the passport he would obtain the necessary visa.

Philpot in the meantime was to see Averill and try to get him to dismiss his servants and install Roper and his wife in their places. As a matter of fact he found this an easy task. Working on the old man’s weakness, Philpot explained that having left the Ransome under a cloud, Roper would be thankful to take a job at a greatly reduced salary. This was enough for Averill, and he at once gave his people notice and offered their positions to the Ropers.

The couple thereupon settled down at Starvel, and by living exemplary lives sought to establish a reputation for integrity which would tend to support the accident theory to be put forward later. Philpot insisted that for at least a year they were to carry out their duties quietly, so that no one would think the “accident” came suspiciously soon after their advent. “We are going to make all the money we want for the rest of our lives,” he would say to Roper. “No precaution is too great to be observed.”

Philpot told Roper quite openly that he wished to use the crime to free himself from the other’s blackmail. Roper on his part accepted the position, as he considered the money would be worth it, and also as he believed that his hold over Philpot would remain strong enough to protect him completely. The two scoundrels therefore concluded their evil compact, deciding to act jointly in all respects and so to bear equal responsibility. After the crime Roper was to emigrate to Brazil, the idea that he had lost his life being suggested by the dreadful expedient of leaving a third body in the house, which, it was hoped, would be taken for his.

The procuring of this third body was not the least of their difficulties. Markham Giles was to be the victim; in fact it was Giles’ existence which had suggested the plan to Philpot. The man was known to be in poor health, and a few doses of a mild poison would make it poorer still. The result was that his death at the critical time excited no comment.

Philpot was to assist in the murders, and partly as a safeguard against night callers, and partly to establish an alibi, he determined to fake illness. He therefore took to his bed on Thursday evening, telling his housekeeper he had influenza. The symptoms were easy to simulate and a doctor knows ways of raising the temperature. His housekeeper and the aged Dr. Emerson were easily deceived, and on the two dreadful nights of crime he was able to leave his house unheard and unsuspected.

For the safe working of the scheme it was necessary that Ruth Averill should be got rid of. We have seen how this was done, but it unexpectedly involved drugging her uncle to prevent the fraud from becoming known. The plan was, of course, Philpot’s. He supplied all the necessary forged letters and the ten pounds, but Roper carried out the actual details. Ruth left for York on the Tuesday, and that evening after dusk had fallen Roper and Philpot met secretly at Markham Giles’ cottage, and there in cold blood the two miscreants murdered the unfortunate man by a forcible injection of cocaine. They left him in bed, Roper undertaking to “discover” his death next morning. On that fatal Wednesday morning he arranged the funeral in such wise that the body would be coffined and left in the house that night.