It was, indeed, the library of the castle, and she was looking at it from the inside of that clock into which Gimblet had once before seen Julia Romaninov vanish. The curtains were drawn in the room, but after the absolute blackness of the stone corridors the semi-dusk looked nearly as bright as full daylight to Juliet, and she had no difficulty in distinguishing that there was but one person in the library, and that person Julia. She was standing by a bookshelf at the far end, near the window, and seemed to be methodically engaged in an examination of the books. Juliet saw her take out first one, then another, musty, leather-bound volume, shake it, turn over the leaves, and put it back in its place after groping with her hand at the back of the shelf. Plainly she was hunting for something. But for what? She had no business where she was, in any case, and Juliet's indignation gathered and swelled within her as she watched this unwarrantable intrusion. She would confront the girl and ask her what she meant by such behaviour. But how to get into the library? Looking about her, she saw that the streak of light in the wall beside her came through a perpendicular crack which might well be the edge of a little door. She pushed gently and the wood yielded to her fingers. CHAPTER XVIII Later on in the afternoon, when Gimblet arrived at the castle, he was immediately shown into the presence of Lord Ashiel, who was pacing the smoking-room restlessly, a cigarette between his teeth. He looked pale and haggard, the strain of the last few days had evidently been too much for him. Gimblet greeted him sympathetically. "You have not found your uncle's will, I can see," he began, "and you are fretting at the idea of keeping his daughter out of her fortune. But set your mind at rest; we shall be able to put that right. Is she here, by the way?" he added, remembering Lady Ruth's anxiety. "Here, of course not! What do you mean?" cried Mark, stopping suddenly in his walk. "Well, I was sure she was not," Gimblet replied, "but I promised to ask. Lady Ruth is rather upset because Miss Byrne did not come in to lunch. I told her she had probably gone for a longer walk than had been her intention," he added soothingly, for Mark was looking at him with a disturbed expression. He seemed relieved, however, by the detective's suggestion.