Page:The Viaduct Murder (1926).pdf/46

forehead. "Yes, that does it. It's a cipher, of course, otherwise there'd be something to explain what it's all about. It will be a book cipher; the first figure gives you the page, the second the line, and the third the word in the line. How's that?"

"That's devilish ingenious," admitted Gordon, "but you can hardly prove it."

"I can practically prove it," said Reeves. "Look here, the man wanted to spell out a message in ten words. There was a book, arranged upon somehow beforehand. The first few words were ordinary words, that you could find anywhere on any page: and naturally, to save himself and the other man trouble in counting, he took them from the top of the page, so you get lines 7, 4, 2, 6, and 4 of pages 8, 18, 21, 25 and 31. The sixth word he wanted was an obscure sort of word, perhaps even a proper name. He had to go right on to page 74, and even then he could only find his word on the 13th line of it. Then the next two words came easy, comparatively, but the ninth word was a brute, he couldn't find it till page 113, and on the 17th line at that. And by that time he'd got nearly to the end of the book⁠—a book, then, of only 120 pages or so probably; a paper edition, I suspect⁠—so he had to go back to the beginning again, which he hadn't meant to do."

"Bravo!" said Gordon. "Have another injection of cocaine."

"The curse of the thing is," said Mordaunt