"I saw him fall," put in a rough man, something like a navvy; "he was crushed up against me in the crowd, and I felt him tumbling. I heard him gurgle, too, and heard this young lady cry out. Then I saw him on the ground, and pushed back the folk, saying there was a cove dying. But I didn't think it was murder," ended the man, shuddering. "Nor did I," chimed in the slim girl. "I fancied it was a fit. I'm sure we were all so crushed up with the lot of people, that I shouldn't have been surprised if he had taken a fit." This was all that could be learned, and the Inspector took the names and addresses of the two who had spoken. There were other people who had noted the man on the ground, but these were the sole ones to see the fall. They had, as it were, almost caught the assassin red-handed. But it was impossible to say who was guilty, for the throng was so dense and every one's attention had been so earnestly fixed skyward on the airships that no one could say who had struck down the unfortunate gentleman. The Inspector was much impressed when he learned the identity of the dead man. Once or twice he had received official letters from Durwin, but he had never set eyes on him until he beheld him dead. But for Laurance he would not have known who he was, and therefore questioned that young gentleman closely when the body was carried by four policemen off the ground to the nearest place where it could be placed under shelter. "And what about this fly?" asked the Inspector, who had heard of the question from the policeman who Laurance had first addressed. "Don't you remember the case of Sir Charles Moon?" "Yes. The woman who killed him was never discovered. I remember about the fly, and also I remember the letters written to that newspaper of yours." "I wrote the first letter that brought forth the correspondence," said Freddy quickly. "Sir Charles had some idea that a gang of criminals was in existence, and invited Mr. Durwin to his house to explain. Before Mr. Durwin arrived Sir Charles was murdered. Since then he had been looking into the matter, and I believe that he also learned too much." "You think that this gang you mention had him put out of the way?" "Yes, I do, and that is why I asked if there was a fly on him. It's the trade-mark of these devils, I fancy." "Well, there didn't appear to be any fly on him," said the Inspector in an uneasy tone. "All the same, I think your idea is right. Moon was murdered because he knew too much, and Mr. Durwin has been got out of the way for the same reason; at least I think so. However, we shall learn more between this and the inquest. You will attend, Mr. Laurance?" "Of course. I am only too anxious to find out all I can about this dangerous gang. It must be broken up." "The breaking up will be attended with considerable danger," said the Inspector in a very dry tone. Then he noted Freddy's address and let him go.