"Wrayson knows nothing of Barnes beyond the fact that they are neighbours in the same flats. Being the assistant editor of a journal of world-wide fame, however, he has naturally a telephone in his flat. By means of that instrument he receives a message in the middle of the night from an unknown person in an unknown place, which he is begged to convey to Barnes. The message is in itself mysterious. Taken in conjunction with what happened to Barnes, it is deeply interesting. Barnes, it seems, is to go immediately on his arrival, at whatever hour, to the Hotel Francis. Presumably he would know from whom the message came, and the sender does not seem to have doubted that if it was conveyed to Barnes he would obey the summons. Wrayson agrees to and does deliver it. That is to say, he writes it down and leaves it in the letter-box of Barnes' door, Barnes not having yet returned. Now we begin to get mysterious. That communication from our friend here has not been discovered. It was not in the letter-box; it was not upon the person of the dead man. We cannot tell whether or not he ever received it. I believe that I am right so far?" "Absolutely," Wrayson admitted. "Our friend Wrayson, then," the Colonel continued, beaming upon his neighbour, "instead of going to bed like a sensible man, takes up a book and falls asleep in his easy-chair. He wakes up about three or four o'clock, and his attention is then attracted by the jingling of a hansom bell below. He looks out of window and sees a cab, both the driver and the occupant of which appear to be asleep. The circumstance striking him as somewhat unusual, he descends to the street and finds--well, rather more than he expected. He finds the cabman asleep, and his fare scientifically and effectually throttled by a piece of silken cord." Wrayson turned to the waiter and ordered a liqueur brandy. "Have one, you fellows?" he asked. "Good! Four, waiter." He tossed his own off directly it arrived. His lips were pale, and the hand which raised the glass to his lips shook. Heneage alone, who was watching him through a little cloud of tobacco smoke, noticed this. "Have you finished with me, Colonel?" Wrayson asked. "Practically," the Colonel answered, smiling, "unless you can answer one of the three queries suggested by my _résumé_. First, who killed Morris Barnes? Secondly, when was it done? Thirdly, where was it done? I have left out a possible fourth, why was it done? because, in this case, I think that the motive and the man are practically identical. I mean that if you discover one, you discover the other." Heneage leaned across the table towards the Colonel. "You are a magician, Colonel," he declared quietly. "I glanced through this case in the paper, and it did not even interest me. Since I have listened to you I have fallen under the spell of the mysterious. Have you any theories?" The Colonel's face fell a little.