VI.
"First, Mr. Hatch," The Thinking Machine resumed, as he drew out and spread on a table the letter which had been originally placed in his hands by Miss Devan, "the question of whether there was a cipher in this letter was to be definitely decided.
"There are a thousand different kinds of ciphers. One of them, which we will call the arbitrary cipher, is excellently illustrated in Poe's story, 'The Gold Bug'. In that cipher, a figure or symbol is made to represent each letter of the alphabet.
"Then, there are book ciphers, which are, perhaps, the safest of all ciphers, because without a clue to the book from which words may be chosen and designated by numbers, no one can solve it.
"It would be useless for me to go into this matter at any length, so let us consider this particular letter as a cipher possibility. A careful study of the letter develops three possible starting points. The first of these is the general tone of the letter. It is not a direct, straight-away statement such as a man about to commit suicide would write unless he had a purpose-that is, a purpose beyond the mere apparent meaning of the letter itself. Therefore we will suppose there was another purpose hidden behind a cipher.
"The second starting point is that offered by the absence of one word. You will see that the word 'in' should appear between the word 'cherished' and 'secret'. This, of course, may have been an oversight in writing, the sort of thing anyone might do. But further down we find the third starting point.
"This is the figure seven in parentheses. It apparently has no connection whatever with what precedes or follows. It could not have been an accident. Therefore what did it mean? Was it a crude outward indication of a hurriedly constructed cipher?
"I took the figure seven at first to be a sort of key to the entire letter, always presuming there was a cipher. I counted seven words down from that figure and found the word 'binding'. Seven words from that down made the next word 'give'. Together the two words seemed to mean something.
"I stopped there and started back. The seventh word up is 'and'. The seventh word from 'and', still counting backward, seemed meaningless. I pursued that theory of seven all the way through the letter and found only a jumble of words. It was the same way counting seven letters. These letters meant nothing unless each letter was arbitrarily taken to represent another letter. This immediately led to intricacies. I believe always in exhausting simple possibilities first, so I started over again.
"Now what word nearest to the seven meant anything when taken together with it? Not 'family', not 'Bible', not 'son', as the vital words appear from the seven down. Going up from the seven, I did find a word which applied to it and meant something. That was the word 'page'. I had immediately 'page seven'. 'Page' was the fifth word up from the seven.
"What was the next fifth word, still going up? This was 'on'. Then I had 'on page seven'-connected words appearing in order, each being the fifth from the other. The fifth word down from seven I found was 'family'; the next fifth word was 'Bible'; thus, 'on page seven family Bible'.
"It is unnecessary to go further into the study I made of the cipher. I worked upward from the seven, taking each fifth word until I had all the cipher words. I have underscored them here. Read the words underscored and you have the cipher."
Hatch took the letter marked as follows:
To those Concerned:
Tired of it all I seek the end, and am content. Ambition is dead; the grave yawns greedily at my feet, and with the labor of my own hands lost I greet death of my own will, by my own act.
To my son I leave all, and you who maligned me, you who discouraged me, you may read this and know I punish you thus. It's for him, my son, to forgive.
I dared in life and dare dead your everlasting anger, not alone that you didn't speak, but that you cherished secret, and my ears are locked forever against you. My vault is my resting place.
On the brightest and dearest page of life I wrote (7) my love for him. Family ties, binding as the Bible itself, bade me give all to my son.
Good-bye. I die.
Pomeroy Stockton
Slowly Hatch read this:
"I am dead at the hands of my son. You who read punish him. I dare not speak. Secret locked vault on page 7 family Bible."
"Well, by George!" exclaimed the reporter. It was a tribute to The Thinking Machine, as well as an expression of amazement at what he read.
"You see," explained The Thinking Machine, "if the word 'in' had appeared between 'cherished' and 'secret', as it would naturally have done, it would have lost the order of the cipher, therefore it was purposely left out."
"It's enough to send Stockton to the electric chair," said Hatch.
"It would be if it were not a forgery," said the scientist testily.
"A forgery," gasped Hatch. "Didn't Pomeroy Stockton write it?"
"No."
"Surely not John Stockton?"
"No."
"Well, who then?"
"Miss Devan."
"Miss Devan!" Hatch repeated in amazement. "Then, Miss Devan killed Pomeroy Stockton?"
"No, he died a natural death."
Hatch's head was whirling. A thousand questions demanded an immediate answer. He stared mouth agape at The Thinking Machine. All his ideas of the case were tumbling about him. Nothing remained.
"Briefly, here is what happened," said The Thinking Machine. "Pomeroy Stockton died a natural death of heart disease. Miss Devan found him dead, wrote this letter, put it in his pocket, put a drop of prussic acid on his tongue, smashed the bottle of acid, left the room, locked the door, and next day had it broken down.
"It was she who shot John Stockton. It was she who tore out page seven of that family Bible, and then hid the book in Stockton's room. It was she who in some way got hold of the will. She either has it or destroyed it. It was she who took advantage of her aged benefactor's sudden death to further as weird and inhuman a plot against another as a woman can devise. There is nothing on God's earth as bad as a bad woman, and nothing as good as a good one. I think that has been said before."
"But as to this case," Hatch interrupted. "How? what? why?"
"I read the cipher within a few hours after I got the letter," replied The Thinking Machine. "Naturally I wanted to find out then who and what this son was.
"I had Miss Devan's story, of course-a story of disagreement between father and son, quarreling and all that. It was also a story which showed a certain underlying animosity despite Miss Devan's cleverness. She had so mingled fact with fiction that it was not altogether easy to weed out the truth, therefore I believed what I chose.
"Miss Devan's idea, as expressed to me, was that the letter was written under coercion. Men who are being murdered don't write cipher letters as intricate as that; and men who are committing suicide have no obvious reasons for writing such letters. The line 'I dare not speak' was silly. Pomeroy Stockton was not a prisoner. If he had feared a conspiracy to kill him why shouldn't he speak?
"All these things were in my mind when I asked you to see Stockton. I was particularly anxious to hear what he had to say as to the family Bible. And yet I may say I knew that page seven had been torn out of the book and was then in Miss Devan's possession.
"I may say, too, that I knew that the secret vault was empty. Whatever these two things contained, supposing she wrote the cipher, had been removed or she would not have called attention to them in this cipher. I had an idea that she might have written it from the mere fact that it was she who first called my attention to the possibility of a cipher.
"Assuming then that the cipher was a forgery, that she wrote it, that it directly accused John Stockton, that she brought it to me, I had fairly conclusive proof that if Pomery Stockton had been murdered she had had a hand in it. John Stockton's motive in trying to suppress the fact of a suicide, as he thought it, was perfectly clear. It was, as he said, to avoid disgrace. Such things are done frequently.
"From the moment you told him of the possibility of murder, he suspected Miss Devan. Why? Because, above all, she had the opportunity, because she wanted the bulk of the estate, because there was some animosity against John Stockton.
"This now proves to have been a broken-off love affair. John Stockton broke it off. He himself had loved Miss Devan. She had refused him. Later, when he broke off the love affair, she hated him.
"Her plan for revenge was almost diabolical. It was intended to give her full revenge and the estate at the same time. She hoped, she knew, that I would read that cipher. She planned that it would send John Stockton to the electric chair."
"Horrible!" commented Hatch with a little shudder.
"It was a fear that this plan might go wrong that induced her to try to kill Stockton by shooting him. The cellar was dark, but she forgot that ninety-nine revolvers out of a hundred leave slight powder stains on the hand of the person who fires them. Stockton said that she did not shoot him, because of that inexplicable loyalty which some men show to a woman they love or have loved.