"Hum!" Dan stroked his chin, "it may be as you say. Certainly Sir Charles was got rid of, because he knew too much."
"About this gang," insisted Laurance, "since he was to see Durwin about the same. I am certain that such an association exists."
"You said that before," Halliday reminded him.
"And I say it again. At all events there is one thing certain--that we have learned from these letters of many mysterious crimes."
"But only in one case was the fly discovered," objected Dan again.
"That is not to be wondered at," replied the journalist; "the wonder is that such a small insect should be noticed at all. No one would ever think of connecting a fly, whether dead or alive, with the death. The mother of this schoolmistress did not, until your experience with regard to Moon was quoted in my letter. The fly business is quite ridiculous."
"Oh, I think it does, seeing that in Moon's case, the fly was artificial. Probably in the case of the schoolmistress it was artificial also, only the mother who noticed it did not make an examination. Why should she? I wonder the gang don't have a better trade-mark."
"Perhaps the gang may think it would be spotted if it did."
"Then why have any trade-mark at all," answered Laurance, sensibly. "If there is to be a sign, there should be some sensible one. If the fly was stamped on the skin, as the purple fern was stamped, there would be some sense in the matter. But a fly, artificial or real, is----" Freddy spread out his hands, for words entirely failed him.
"Well," said Dan after a pause, "I don't know what to say, since everything is so vague. However, I shall assume that such a gang exists, and shall do my best to aid you to bring about its destruction, as that means my marriage to Lillian. To help, I must have money, so the sooner we get North and engage one of Vincent's machines with all the latest improvements, the better shall I be pleased." He moved towards the door, as they were in Laurance's rooms when this conversation took place, and there he halted. "I think, Freddy, you will have a chance of proving in your own person, as to the truth of your supposition regarding this gang!"
"What do you mean?" asked Laurance somewhat startled.