The plan, which Dan intended to carry into effect when he reached Town, was to force Penn into confessing what he actually knew concerning the perfume. He had obviously spoken falsely as to his being its sole possessor in England, since Mrs. Jarsell had given the like scent to her old governess. Yet, why should Penn lie in this fashion, unless there was some secret connected with the perfume, which he desired to keep concealed. And assuredly the scent had clung round the clothes of the dead man. Dan determined to force Penn into confession, and that could only be done by frightening him greatly. To carry out this plan, Halliday wrote to the man asking him for an interview, and when he came--as Dan was certain he would--intended, in some way, to inveigle him into taking a flight. Once Penn was in the air his fears could be played upon to some purpose. At least Dan thought so, and was eager to make the experiment. Of course, the young man did not suspect Mrs. Jarsell of being connected in any way with crime of any sort. Still it was strange that the perfume from Sumatra should form a link between her and Sir Charles Moon, with Penn intervening. It was also strange that Mrs. Pelgrin should hint that Mrs. Jarsell had secrets. She had not said as much in so many words, but the general trend of her cautious conversation went to show that Mrs. Jarsell was not entirely open and aboveboard. The landlady had wondered where the owner of the Grange got her money. Now why should she so wonder, unless she had proofs that the said money was not come by honestly? And why, also, should she, in a quite unnecessary way, mention her nephew, who was the Thawley station porter--friendly with Mrs. Jarsell to such an extent that there was a chance of his getting a legacy? Ladies of wealth do not make friends of railway porters without reason, and Dan wished to learn the reason in this particular case. By a diplomatic question he had ascertained from Mrs. Pelgrin that her nephew was the sole Sheepeak person employed at the station. Consequently he would naturally be the sole person who knew Mrs. Jarsell and all about her; therefore it was not impossible that the lady befriended the man so that he might not speak of her visits to town. Yet why should he not do so, should Mrs. Jarsell's doings be entirely honest? Then there were three motor cars, a quite unnecessary number for a lady to keep, especially as, according to her own story, she went out little and spent most of her time in attending to Miss Armour. On the whole, although his suspicions were vague, Dan had an idea that Mrs. Jarsell's doings would not bear the light of day. Still--and especially since she had procured him the biplane--he would not have troubled about her rustic affairs save for the fact of the perfume. It might be--and this he hoped to discover--that Penn's confession would show more plainly the link which connected Mrs. Jarsell with the Hampstead crime.