“The same person desired the death of Louis Glenn. Again, he arranged that death and sent a message.
“Now, our big brain, as you term him, has arranged the death of a third party — a death scheduled to take place last night.
“He has again posted an announcement. He refers to the third person as T.S. We have not yet discovered the actual death of T.S., whoever he may be.
“Has the big brain, as you call him, contemplated more killings? Perhaps. We shall ascertain that fact later on. But I have given you, in compact form, the vital points that concern the deaths of Silas Harshaw and Louis Glenn.
“I have also considered the possibilities of a third death — which concerns a man whose initials are T.S.”
“That’s a clean-cut theory,” admitted Cardona. “It rings clear, professor. But where does this other killing figure into it? What about the man who got away after he killed the fellow?”
“Cross-purposes,” replied Roger Biscayne. “Some one had the burglary motive. He came in through the window. He entered a trap. He was shot and killed.”
“By whom?”
“Well,” said Biscayne slowly, “I can only believe that there were two men who entered the window. They might have been working together.
“Why one should kill the other is more than I can fathom, at present. It seems quite creditable that such purpose may have been present.