"We speak together to-night, then?" She shook her head at him, smiling all the time though, and with that little tantalising look in her eyes which Leonard and I both knew so well. "I am not sure," she replied. "The management will complain if I talk so much with one of the guests, but I will play 'Valse Triste' for you. Au revoir!" We had almost left the hotel--we were on the outside steps, indeed--when the hall porter caught me up. I saw at once what he was carrying. It was one of the now familiar typewritten letters. This time I asked him a point-blank question. "Look here," I said, with my hand in my trousers pocket, "this is the third note I have received from my friend in this fashion. I want to know how they come into your possession. Who leaves them at the bureau?" The man saw the ten-shilling note in my hand but he only shook his head. I believe that he was perfectly honest. "I would tell you in a minute if I knew, sir," he declared, "but to tell you the truth I have never seen one delivered. All three I have picked up from the desk in my office, evidently left there when my back was turned for a moment." "You haven't any idea who leaves them there, then?" I persisted. "Not the slightest, sir," the man assured me. "Keep a good lookout," I begged him, "and let me know if you do find out. There may be another one--I can't tell--but I'll double this ten shillings if you succeed." The man thanked me and withdrew. We three crossed to the less frequented side of the road. I walked in the middle, with Rose and Leonard on either arm. We read the note together: If the box Miss Mindel saw in Kinlosti's room was of purple leather, with gold clasps and corners, let the first item in your repertoire to-night be the Missouri Waltz. If it was a box of any other description, play the selection from "Chu-Chin-Chow." "Well, I'm damned!" Leonard exclaimed. "Be careful," I advised. "Thomson's probably underneath these paving stones." Rose shivered a little. "Do you think he wants to steal the jewels, Maurice?" she asked me. "Oh, no!" I answered. "He probably wants to borrow them to wear at the Lord Mayor's show!" She made a grimace. "That's all very well, Mr. Lister," she said, with a great attempt at hauteur, "but will you kindly remember that you two are not in at this show? It is I who seem to be chosen as principal accomplice. I am not exactly infatuated with Mr. Kinlosti, but I don't want him to lose his jewels." "I bet you a four-pound box of chocolates he does lose them," Leonard observed. Rose sighed. "Anyhow," she murmured, "we shall have to play 'Chu-Chin-Chow' to-night."