“Hetty, what did you see in Mrs. Quintard’s action last night, to make you infer that she left the missing document in this room?” The woman’s eyes, which had been respectfully studying her face, brightened with a relief which made her communicative. With the self-possession of a perfectly candid nature, she inquiringly remarked: “My mistress has spoken of her infirmity?” “Yes, and very frankly.” “She walks in her sleep.” “So she said.” “And sometimes when others are asleep, and she is not.” “She did not tell me that.” “She is a very nervous woman and cannot always keep still when she rouses up at night. When I hear her rise, I get up too; but, never being quite sure whether she is sleeping or not, I am careful to follow her at a certain distance. Last night I was so far behind her that she had been to her brother’s room and left it before I saw her face.” “Where is his room and where is hers?” “Hers is in front on this same floor. Mr. Brooks’s is in the rear, and can be reached either by the hall or by passing through this room into a small one beyond, which we called his den.” “Describe your encounter. Where were you standing when you saw her first?” “In the den I have just mentioned. There was a bright light in the hall behind me and I could see her figure quite plainly. She was holding a folded paper clenched against her breast, and her movement was so mechanical that I was sure she was asleep. She was coming this way, and in another moment she entered this room. The door, which had been open, remained so, and in my anxiety I crept to it and looked in after her. There was no light burning here at that hour, but the moon was shining in in long rays of variously coloured light. If I had followed her--but I did not. I just stood and watched her long enough to see her pass through a blue ray, then through a green one, and then into, if not through, a red one. Expecting her to walk straight on, and having some fears of the staircase once she got into the hall, I hurried around to the door behind you there to head her off. But she had not yet left this room. I waited and waited and still she did not come. Fearing some accident, I finally ventured to approach the door and try it. It was locked. This alarmed me. She had never locked herself in anywhere before and I did not know what to make of it. Some persons would have shouted her name, but I had been warned against doing that, so I simply stood where I was, and eventually I heard the key turn in the lock and saw her come out. She was still walking stiffly, but her hands were empty and hanging at her side.” “And then?” “She went straight to her room and I after her. I was sure she was dead asleep by this time.” “And she was?”