I clung to the thought of the telephone. It gave me the quiet satisfaction of the gambler who holds the unforeseen ace. The situation was in my hands. The police, I knew, had been profoundly stirred by Mr MacGinnis's previous raid. When I called them up, as I proposed to do directly the door had closed on the ambassadors, there would be no lack of response. It would not again be a case of Inspector Bones and Constable Johnson to the rescue. A great cloud of willing helpers would swoop to our help. With these thoughts in my mind, I answered Sam pleasantly but firmly. 'I'm sorry I'm unpopular, but all the same--' I indicated the door. Emotion that could only be expressed in words and not through his usual medium welled up in Mr MacGinnis. He sprang forward with a snarl, falling back as my faithful automatic caught his eye. 'Say, you! Listen here! You'll--' Sam, the peaceable, plucked at his elbow. 'Nothing doing, Buck. Step lively.' Buck wavered, then allowed himself to be drawn away. We passed out of the classroom in our order of entry. An exclamation from the stairs made me look up. Audrey was leaning over the banisters. Her face was in the shadow, but I gathered from her voice that the sight of our little procession had startled her. I was not surprised. Buck was a distinctly startling spectacle, and his habit of growling to himself, as he walked, highly disturbing to strangers. 'Good evening, Mrs Sheridan,' said Sam suavely. Audrey did not speak. She seemed fascinated by Buck. I opened the front door and they passed out. The automobile was still purring on the drive. Buck's pistol had disappeared. I supposed the chauffeur had picked it up, a surmise which was proved correct a few moments later, when, just as the car was moving off, there was a sharp crack and a bullet struck the wall to the right of the door. It was a random shot, and I did not return it. Its effect on me was to send me into the hall with a leap that was almost a back-somersault. Somehow, though I was keyed up for violence and the shooting of pistols, I had not expected it at just that moment, and I was disagreeably surprised at the shock it had given me. I slammed the door and bolted it. I was intensely irritated to find that my fingers were trembling. Audrey had left the stairs and was standing beside me. 'They shot at me,' I said. By the light of the hall lamp I could see that she was very pale. 'It missed by a mile.' My nerves had not recovered and I spoke abruptly. 'Don't be frightened.' 'I--I was not frightened,' she said, without conviction. 'I was,' I said, with conviction. 'It was too sudden for me. It's the sort of thing one wants to get used to gradually. I shall be ready for it another time.' I made for the stairs. 'Where are you going?' 'I'm going to call up the police-station.' 'Peter.' 'Yes?' 'Was--was that man the one you spoke of?' 'Yes, that was Buck MacGinnis. He and Sam have gone into partnership.' She hesitated.