Miss Devan had a soft, soothing voice, and as she talked it was broken at times by what seemed to be a sob. Her face was flushed a little, and she emphasized her points by a quick clasping and unclasping of her daintily gloved hands.
"My father, or rather my adopted father, Pomeroy Stockton, was an inventor," she began. "We lived in a great, old-fashioned house in Dorchester. We have lived there since I was a child. When I was only five or six years old, I was left an orphan and was adopted by Mr. Stockton, then a man of forty years. I am now twenty-three. I was raised and cared for by Mr. Stockton, who always treated me as a daughter. His death, therefore, was a great blow to me.
"Mr. Stockton was a widower with only one child of his own, a son, John Stockton, who is now about thirty-one years old. He is a man of irreproachable character, and has always, since I first knew him, been religiously inclined. He is the junior partner in a great commercial company, Dutton & Stockton, leather men. I suppose he has an immense fortune, for he gives largely to charity, and is, too, the active head of a large Sunday school.
"Pomeroy Stockton, my adopted father, almost idolized this son, although there was in his manner toward him something akin to fear. Close work had made my father querulous and irritable. Yet I don't believe a better hearted man ever lived. He worked most of the time in a little shop, which he had installed in a large back room on the ground floor of the house. He always worked with the door locked. There were furnaces, moulds, and many things that I didn't know the use of."
"I know who he was," said The Thinking Machine. "He was working to re-discover the secret of hardened copper-a secret which was lost in Egypt. I knew Mr. Stockton very well by reputation. Go on."
"Whatever it was he worked on," Miss Devan resumed, "he guarded it very carefully. He would permit no one at all to enter the room. I have never seen more than a glimpse of what was in it. His son particularly I have seen barred out of the shop a dozen times and every time there was a quarrel to follow.
"Those were the conditions at the time Mr. Stockton first became ill, six or seven months ago. At that time he double-locked the doors of his shop, retired to his rooms on the second floor, and remained there in practical seclusion for two weeks or more. These rooms adjoined mine, and twice during that time I heard the son and the father talking loudly, as if quarreling. At the end of the two weeks, Mr. Stockton returned to work in the shop and shortly afterward the son, who had also lived in the house, took apartments in Beacon Street and removed his belongings from the house.
"From that time up to last Monday-this is Thursday-I never saw the son in the house. On Monday the father was at work as usual in the shop. He had previously told me that the work he was engaged in was practically ended and he expected a great fortune to result from it. About 5 o'clock in the afternoon on Monday the son came to the house. No one knows when he went out. It is a fact, however, that Father did not have dinner at the usual time, 6:30. I presumed he was at work, and did not take time for his dinner. I have known him to do this many times."
For a moment the girl was silent and seemed to be struggling with some deep grief which she could not control.
"And next morning?" asked The Thinking Machine gently.
"Next morning," the girl went on, "Father was found dead in the workshop. There were no marks on his body, nothing to indicate at first the manner of death. It was as if he had sat in his chair beside one of the furnaces and had taken poison and died at once. A small bottle of what I presume to be prussic acid was smashed on the floor, almost beside his chair. We discovered him dead after we had rapped on the door several times and got no answer. Then Montgomery, our butler, smashed in the door, at my request. There we found Father.
"I immediately telephoned to the son, John Stockton, and he came to the house. The letter you now have was found in my father's pocket. It was just as you see it. Mr. Stockton seemed greatly agitated and started to destroy the letter. I induced him to give it to me, because instantly it occurred to me that there was something wrong about all of it. My father had talked too often to me about the future, what he intended to do and his plans for me. There may not be anything wrong. The letter may be just what it purports to be. I hope it is-oh-I hope it is. Yet everything considered--"
"Was there an autopsy?" asked The Thinking Machine.
"No. John Stockton's actions seemed to be directed against any investigation. He told me he thought he could do certain things which would prevent the matter coming to the attention of the police. My father was buried on a death certificate issued by a Dr. Benton, who has been a friend of John Stockton since their college days. In that way the appearance of suicide or anything else was covered up completely.
"Both before and after the funeral John Stockton made me promise to keep this letter hidden or else destroy it. In order to put an end to this I told him I had destroyed the letter. This attitude on his part, the more I thought of it, seemed to confirm my original idea that it had not been suicide. Night after night I thought of this, and finally decided to come to you rather than to the police. I feel that there is some dark mystery behind it all. If you can help me now--"
"Yes, yes," broke in The Thinking Machine. "Where was the key to the workshop? In Pomeroy's pocket? In his room? In the door?"
"Really, I don't know," said Miss Devan. "It hadn't occurred to me."
"Did Mr. Stockton leave a will?"
"Yes, it is with his lawyer, a Mr. Sloane."
"Has it been read? Do you know what is in it?"
"It is to be read in a day or so. Judging from the second paragraph of the letter, I presume he left everything to his son."
For the fourth time The Thinking Machine read the letter. At its end he again looked up at Miss Devan.
"Just what is your interpretation of this letter from one end to the other?" he asked.
"Speaking from my knowledge of Mr. Stockton and the circumstances surrounding him," the girl explained, "I should say the letter means just what it says. I should imagine from the first paragraph that something he invented had been taken away from him, stolen perhaps. The second paragraph and the third, I should say, were intended as a rebuke to certain relatives-a brother and two distant cousins-who had always regarded him as a crank and took frequent occasion to tell him so. I don't know a great deal of the history of that other branch of the family. The last two paragraphs explain themselves except--"
"Except the figure seven," interrupted the scientist. "Do you have any idea whatever as to the meaning of that?"
The girl took the letter and studied it closely for a moment.
"Not the slightest," she said. "It does not seem to be connected with anything else in the letter."
"Do you think it possible, Miss Devan, that this letter was written under coercion?"
"I do," said the girl quickly, and her face flamed. "That's just what I do think. From the first I have imagined some ghastly, horrible mystery back of it all."
"Or, perhaps Pomeroy Stockton never saw this letter at all," mused The Thinking Machine. "It may be a forgery?"
"Forgery!" gasped the girl. "Then John Stockton--"
"Whatever it is, forged or genuine," The Thinking Machine went on quietly, "it is a most extraordinary document. It might have been written by a poet. It states things in such a roundabout way. It is not directly to the point, as a practical man would have written."
There was silence for several minutes and the girl sat leaning forward on the table, staring into the inscrutable eyes of the scientist.
"Perhaps, perhaps," she said, "there is a cipher of some sort in it?"
"That is precisely correct," said The Thinking Machine emphatically. "There is a cipher in it, and a very ingenious one."
II.
It was twenty-four hours later that The Thinking Machine sent for Hutchinson Hatch, reporter, and talked over the matter with him. He had always found Hatch a discreet, resourceful individual, who was willing to aid in any way in his power.
Hatch read the letter, which The Thinking Machine had said contained a cipher, and then the circumstances as related by Miss Devan were retold to the reporter.
"Do you think it is a cipher?" asked Hatch in conclusion.
"It is a cipher," replied The Thinking Machine. "If what Miss Devan has said is correct, John Stockton cannot have said anything about the affair. I want you to go and talk to him, find out all about him and what division of the property is made by the will. Does this will give everything to the son?
"Also find out what personal enmity there is between John Stockton and Miss Devan, and what was the cause of it. Was there a man in it? If so, who? When you have done all this, go to the house in Dorchester and bring me the family Bible, if there is one there. It's probably a big book. If it is not there, let me know immediately by 'phone. Miss Devan will, I suppose, give it to you, if she has it."
With these instructions Hatch went away. Half an hour later he was in the private office of John Stockton at the latter's place of business. Mr. Stockton was a man of long visage, rather angular and clerical in appearance. There was a smug satisfaction about the man that Hatch didn't quite approve of, and yet it was a trait which found expression only in a soft voice and small acts of needless courtesy.
A deprecatory look passed over Stockton's face when Hatch asked the first question, which bore on his relationship with Pomeroy Stockton.
"I had hoped that this matter would not come to the attention of the press," said Stockton in an oily, gentle tone. "It is something which can only bring disgrace upon my poor father's memory, and his has been a name associated with distinct achievements in the progress of the world. However, if necessary, I will state my knowledge of the affair, and invite the investigation which, frankly, I will say, I tried to stop."
"How much was your father's estate?" asked Hatch.
"Something more than a million," was the reply. "He made most of it through a device for coupling cars. This is now in use on practically all the railroads."
"And the division of this property by will?" asked Hatch.
"I haven't seen the will, but I understand that he left practically everything to me, settling an annuity and the home in Dorchester on Miss Devan, whom he had always regarded as a daughter."
"That would give you then, say, two-thirds or three-quarters of the estate."