Gaston Leroux: The Mystery of the Yellow Room

CHAPTER 20: An Act of Mademoiselle Stangerson (continued)

And he made me enter a little dark, triangular closet built in a bend of the wall, to the left of the door of Arthur Rance's room. >From this recess I could see all that occurred in the gallery as well as if I had been standing in front of Arthur Rance's door, and I could watch that door, too. The door of the closet, which was to be my place of observation, was fitted with panels of transparent glass. In the gallery, where all the lamps had been lit, it was quite light. In the closet, however, it was quite dark. It was a splendid place from which to observe and remain unobserved.

I was soon to play the part of a spy - a common policeman. I wonder what my leader at the bar would have said had he known! I was not altogether pleased with my duties, but I could not refuse Rouletabille the assistance he had begged me to give him. I took care not to make him see that I in the least objected, and for several reasons. I wanted to oblige him; I did not wish him to think me a coward; I was filled with curiosity; and it was too late for me to draw back, even had I determined to do so. That I had not had these scruples sooner was because my curiosity had quite got the better of me. I might also urge that I was helping to save the life of a woman, and even a lawyer may do that conscientiously.

We returned along the gallery. On reaching the door of Mademoiselle Stangerson's apartment, it opened from a push given by the steward who was waiting at the dinner-table. (Monsieur Stangerson had, for the last three days, dined with his daughter in the drawing-room on the first floor.) As the door remained open, we distinctly saw Mademoiselle Stangerson, taking advantage of the steward's absence, and while her father was stooping to pick up something he had let fall, pour the contents of a phial into Monsieur Stangerson's glass.