At the same moment Wenk saw three gentlemen entering the circle of light in the room. The first was a young man whom he knew by sight, for a few days previously he had noticed him at an exhibition of Futurist paintings, as the buyer of the most unusual and bizarre of these. He had asked the name of the purchaser, and the attendant had replied, “Graf Told bought them. There he is,” pointing to the young man, who had just now entered the room. “Herr von Wenk,” said the lady in a whisper, “will you do me a great favour?” “With pleasure, madam. I am at your command.” “I am anxious to leave this room within the next few minutes without being seen. Can you help me to do this?” “Certainly,” said Wenk. “How can I accomplish my purpose?” “That is quite simple. You see the entrance to that staircase; it is only a few steps to it. You must look at it well, to be able to find it in the dark. I am certain that I know where the electric light switch is. It is just over the first section of the stairs. I will go there and turn it out, and you can make use of the darkness to gain the staircase. When you have passed me I will stand directly in the way of anyone who tries to follow you or to reach the switch.” “Splendid! Thank you very much.” Her escape was safely made. When Wenk saw the lady had reached the bottom, he turned the light on again and entered the room with a light laugh, saying, “Please forgive me; I did it for a joke, and I did not realize you would be in total darkness.” They all laughed, but the dancer was standing, pale and disturbed, at the head of the winding stair, which she had reached at one bound. She recovered herself quickly and returned to Hull, begging him to drive her home. Wenk accompanied them. As they were about to leave the gaming-hall, Wenk saw the head-waiter hand Hull an envelope. He went to an empty table beneath a lamp, opened it, and drew out a little note. It seemed as if an invisible thrust had sent him staggering. Cara went up to him, but he crumpled up the note, stuffing it into his pocket, and rose and followed the others out. When they had reached the street they parted, but Hull turned and came back to Wenk, saying, in a voice trembling with excitement, “I _must_ speak to you. This very night! Can you see me at your rooms in an hour’s time? It is something horrible; I am being shadowed!” * * * * * “Look at this!” said Hull, as he entered Wenk’s rooms an hour later. With a despairing gesture he flung an envelope on Wenk’s table. The latter opened it and drew a small card from it. On it there stood: HERR BALLING, I O U 20,000 (twenty thousand) marks payable November 21st, 4 p.m. EDGAR HULL. “My I O U,” said Hull in a toneless voice, and after a pause, “Look at the other side!”