As Gerald Durrant travelled back to his home, he reflected deeply upon the whole affair. Though he had not dared to mention the fact to Marigold, he was more deeply in love with her than ever. She was the most dainty and most beautiful girl he had ever met. She was chic to the finger-tips, and among the many girl clerks he met daily she was outstanding on account of her refinement, her modesty, and the sweet expression always upon her countenance. Yet the problem which she had put forward to him was certainly an inscrutable one. Boyne, the highly respectable, hard-working insurance agent, lived in that dingy and rather stuffy house surrounded by meagre comfort which, in itself, betokened modest means. For every penny Bernard Boyne gained he worked very hard. Insurance agency is not highly-paid, for everything is nowadays cut to a minimum, while since the war the cost of living has soared. Nevertheless, as he sat in the train taking him westward, he examined the facts. Boyne employed as housekeeper a woman who was stone-deaf. Why? Was it because the person confined behind that stout door upstairs sometimes shouted and made noises which would have attracted the attention of any person who possessed the sense of hearing? That this was so he was convinced. Had it not been proved by Boyne carrying food to the mysterious person who was his captive, or who remained in voluntary concealment? If the latter, why did he disguise himself each time he paid him a visit? No. Somebody was held there captive against his will, and the reason of the wearing of that cloak was in order that the captor should remain unknown and unidentified. Truly, there was an element of sensationalism in the whole affair! He was, however, determined to get to the bottom of it. Marigold had, in her perplexity, consulted him, and he had given his aid. Now, having witnessed what he had, he meant to carry the affair through, and solve the mystery of Bernard Boyne and his locked room in Hammersmith. It occurred to him that perhaps by watching Boyne’s movements he might learn something of interest. The unfortunate part of it was that in his position he was engaged all day, and could never have any time to devote to the affair till six or seven o’clock. Nevertheless, he had made a firm resolve to discover the reason of that locked room, and the identity of the person concealed within. Supposing the person to be some relative who was insane, or whose personal appearance was too horrible to be seen in public—and there are all sorts of human monstrosities living in concealment in London—then there could be no reason why Boyne should hide his face when visiting him. No. Somebody was held there, a prisoner in solitary confinement. He recollected the heavy door, and the light beneath. Did they not tell their own tale?