Madame Bonnell gave me an appealing look, of which I thought it best to take no notice. I had seen nothing of her during the time I had spent at the dance, and I was confident that she was quite ignorant of my presence at it. She found herself compelled to speak without assistance. “The Doctor Cassilis is mistaken,” she said at last, with an air of weighing each word before she uttered it. “Monsieur Wilson was acquainted with the people whom he introduced here, undoubtedly, but they were not all his friends. On the contrary, some of them were his enemies, and he went in fear of them. Even in mortal fear.” It was the revelation Tarleton seemed to have been anticipating. He gave the short, satisfied nod I knew so well. “Go on,” he commanded. “Explain how you knew this.” “In effect I knew it because he told me so himself. He took me into his confidence in order to ask for my protection. He feared this very thing that has happened. He instructed me to pour out everything he was to drink with my own hands, and to send it to him by the waiter he thought he could trust--Gerard.” “Now I think we have some real information,” the specialist observed. “Be good enough to send for Gerard, if you please.” CHAPTER III THE EVIDENCE OF THE DEAD At this point I began to feel a touch of nervousness. I had faced the proprietress of the Domino Club without any, because she had not seen me even in my disguise. But the waiters had been going to and fro throughout the night. I had given orders once or twice, and I could not feel certain that my voice would not be recognized. I told myself that my fear was fanciful, and that the last thing that could occur to anyone’s mind was that a representative of the Home Office, engaged in the investigation, had himself been present on the scene of the crime, if crime it was. But none the less I resolved to do nothing to attract the waiter’s notice, if I could help it. I saw Tarleton frown as Madame Bonnell returned with her servant. He gave her an authoritative nod. “Thank you, Madame. I won’t detain you while I am questioning this man.” The prudent Frenchwoman concealed any vexation she may have felt, and instantly retired, leaving Gerard alone with us. He was as much the type of the discreet waiter as Madame was of the discreet manageress. If he had only possessed side-whiskers he would have been the perfect waiter of the French stage. But he was a good deal younger than Madame, and showed less self-possession. His eyes searched us nervously in turn as though he were looking for someone to propitiate. The physician read his rather white face with one swift glance, and came to his relief. “You are not under any suspicion, Gerard. Provided you tell the truth, you have nothing to fear.”