third question to the gloomy Scot. "Was Sir Charles a friend of Mr. Nicol Brinn?" he asked.
"Nicol Brinn?" echoed the physician. He looked perplexed. "You mean the American millionaire? I believe they were acquainted. Abingdon knew most of the extraordinary people in London; and if half one hears is true Nicol Brinn is as mad as a hatter. But they were not in any sense friends as far as I know." He was watching Harley curiously. "Why do you ask that question?"
"I will tell you in a moment," said Harley, rapidly, "but I have one more question to put to you first. Does the term Fire-Tongue convey anything to your mind?"
Doctor McMurdoch's eyebrows shot upward most amazingly. "I won't insult you by supposing that you have chosen such a time for joking," he said, dourly. "But if your third question surprised me, I must say that your fourth sounds simply daft."
"It must," agreed Harley, and his manner was almost fierce; "but when I tell you why I ask these two questions—and I only do so on the understanding that my words are to be treated in the strictest confidence—you may regard the matter in a new light. 'Nicol Brinn' and 'Fire-Tongue' were the last words which Sir Charles Abingdon uttered."
"What!" cried Doctor McMurdoch, displaying a sudden surprising energy. "What?"
"I solemnly assure you," declared Harley, "that
