Such was the gist of the story as understood by French. He thought it over in some doubt, considering it from various angles. The tale certainly hung together, and there was nothing impossible in it. Everything indeed might well have taken place exactly as described, and French felt that had he not known of the confession, no suspicion of foul play would have entered his mind. But in the light of the confession he saw that the events might bear another interpretation. Philpot was alone with his wife at the time of the occurrence; and he probably knew beforehand that he would be alone, that Flora had obtained half an hour’s leave of absence. When Flora returned Mrs. Philpot was dead. There was no witness of the accident. No one other than Philpot knew how the lady died. To have staged the accident would have been easy, and a blow on the temple with some heavy weapon such as a cricket bat would have produced a bruise similar to that caused by a fall. Moreover, a resourceful man could have produced the suggestion that she had tripped by deliberately raising the edge of the carpet at the hole. Yes, it could all have been done exactly as the confession suggested. Were these the considerations, French wondered, which had caused the dissatisfaction in the mind of the local superintendent, or were there still further circumstances throwing suspicion on Philpot? Whether or not, he felt the case against the doctor was strong enough to justify a visit to Kintilloch. But one point—a vital one—he could settle before starting, or so he believed. Walking down the Embankment to Charing Cross, he went to the writing room of the station hotel and wrote a letter on the hotel paper. “5_th_ _November_. “Dear Sir,—I should be grateful if you would kindly inform me if a man named Henry Fuller ever worked for you as gardener, and if so, whether you found him satisfactory. He has applied to me for a job, giving you as a reference. “Apologising for troubling you, “Yours faithfully, “Charles Musgrave.” French addressed his letter to “Herbert Philpot, Esq., M.D., Thirsby, Yorkshire, W.R.” and dropping it into the hotel letter box, returned to the Yard. Two days later he called for the reply, explaining to the porter that he had intended to stay in the hotel but had had to change his plans. Dr. Philpot wrote briefly that there must be some mistake, as no one of the name mentioned had ever worked for him. But French was not interested in the career of the hypothetical Henry Fuller. Instead he laid the letter down on his desk beside the confession and with a powerful lens fell to comparing the two.