"Of course. He probably also knew where our meeting with Mr. Steel was to take place."
"Then the matter is pretty obvious," said Rawlins. "Van Sneck, by some means or other, gets an inkling of what is going on. He wanted money from Henson, which he couldn't get, Henson being very short lately, and then they quarrelled. Van Sneck was fool enough to threaten Henson with what he was going to do. Van Sneck's note was dispatched by hand and intercepted by Henson with a reply. By the way, will you be good enough to give me the gist of the reply?"
"It was a short letter from Mr. Steel and signed with his initials, and saying in effect that he was at home every night and would see Van Sneck about twelve or some time like that. He was merely to knock quietly, as the household would be in bed, and Mr. Steel would let him in."
"And Mr. Steel never wrote that letter at all?"
"No; for the simple reason that he never had Van Sneck's note."
"Which Henson intercepted, of course. Now, the mere fact of the reply coming on Mr. Steel's paper is evidence that Henson had plotted some other or alternative scheme against Mr. Steel. How long before the cigar-case episode had you decided to consult the novelist?"
"We began to talk about it nine or ten days before."
"And Henson got to hear of it. Then a better idea occurred to Henson, and the first idea which necessitated getting hold of Mr. Steel's notepaper was abandoned. Subsequently, as you have just told me, the note-paper came in useful after all. Henson knew that Steel would be out that night. And, therefore, Van Sneck is deliberately lured to Steel's house to be murdered there."
"I see," Chris said, faintly. "This had never occurred to me before.
Murdered, by whom?"
"By whom? Why, by Reginald Henson, of course."