"Stop a moment please! Let me see the marks on the wall before any one enters; the passage is narrow and they may be rubbed off." A glance was enough, just time enough to formulate which was the symbol of "a" and which of "b." The perpendicular strokes were "a" and the horizontal "b." Marjory had kept her head, even at this trying time, and was leaving a message for me as she was forced along. I understood why the struggle had ceased. Seized and forced through the narrow doorway, she had at first struggled hard. Then, when she realised that she could leave a clue behind her, she had evidently agreed to go quietly; for so she might have her hands free. It would be a hard job to carry or force along an unwilling captive through that narrow uneven passage; doubtless the captors were as willing as she was that she should go quietly. I said to the detectives: "These marks on the wall are in a cipher which I can read. Give me the best lamp we have, and let me go first." So, in an orderly procession, leaving two men in the library with Mrs. Jack to guard the entrance, we passed into the secret passage. As I read off the words written on the wall, the man with the note-book took them down, his companion holding a candle so as to enable him to do so. How my heart beat as I read my dear girl's message, marked on the wall on the inner side whichever way the curves ran. Obviously it would create less attention by guiding herself in this wise as she passed. She had kept her hand well down so that her signs should not be confused with the marks made by the men who, guiding themselves likewise, had held their hands at a natural height. Her sign marks ran continuously, even after we had passed into the passage between the chapel and the monument; the writing ran as follows: "Four men came in--two waiting in passage through bookcase--late--striking one--struggled--then quiet--hands free--same voice we heard in Chapel. Feathers thin voice, small man, dark--all masked--Whisky Tommy hoarse voice, big man, sandy, large hands--Dago, deep voice, swarthy, little finger missing left hand--Max, silent, nods for speech, think dumb--two others on ahead too far see, hear." In a pause I heard the chief detective murmur: