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and was about to speak when The Thinking Machine stopped beside her and placed his slim fingers on her wrist. She did not resent the action; was only curious if one might judge from her eyes.

      “Are you prepared for a shock?” the scientist asked.

      “What is it?” she demanded in sudden terror. “This suspense—”

      “Your husband is dead—murdered—poisoned!” said the scientist with sudden brutality. His fingers still lay on her pulse. “The court plaster which you put on his arm and which came from your room was covered with a virulent poison which was instantly transfused into his blood.”

      Mrs. Dudley did not start or scream. Instead she stared up at The Thinking Machine a moment, her face became pallid, a little shiver passed over her. Then she fell back on the couch in a dead faint.

      “Good!” remarked The Thinking Machine complacently. And then as Hatch started up suddenly: “Shut that door,” he commanded.

      The reporter did so. When he turned back his companion was leaning over the unconscious woman. After a moment he left her and went to a window where he stood looking out. As Hatch watched he saw the colour coming back into Mrs. Dudley’s face. At last she opened her eyes.

      “Don’t get hysterical,” The Thinking Machine directed calmly. “I know you had nothing whatever to do with your husband’s death. I want only a little assistance to find out who killed him.”

      “Oh, my God!” exclaimed Mrs. Dudley. “Dead! Dead!”

      Suddenly tears leapt from her eyes and for several minutes the two men respected her grief. When at last she raised her face her eyes were red, but there was a rigid expression about the mouth.

      “If I can be of any service—” she began.

      “Is this the boat house I see from this window?” asked The Thinking Machine. “That long, low building with the light over the door?”

      “Yes,” replied Mrs. Dudley.

      “You say you don’t know if the motor boat is there now?”

      “No, I don’t.”

      “Will you ask your Japanese servant, and if he doesn’t know, let him go see, please?”

      Mrs. Dudley arose and touched an electric button. After a moment the Japanese appeared at the door.

      “Osaka, do you know if Mr. Dudley’s motor boat is in the boat house?” she asked.

      “No, honourable lady.”

      “Will you go yourself and see?”

      Osaka bowed low and left the room, closing the door gently behind him. The Thinking Machine again crossed to the window and sat down staring out into the night. Mrs. Dudley asked questions, scores of them, and he answered them in order until she knew the details of the finding of her husband’s body—that is, the details the public knew. She was interrupted by the reappearance of Osaka.

      “I do not find the motor boat in the house, honourable lady.”

      “That is all,” said the scientist.

      Again Osaka bowed and retired.

      “Now, Mrs. Dudley,” resumed The Thinking Machine almost gently, “we know your husband wore a French naval costume at the masked ball. May I ask what you wore?”

      “It was a Queen Elizabeth costume,” replied Mrs. Dudley, “very heavy with a long train.”

      “And if you could give me a photograph of Mr. Dudley?”

      Mrs. Dudley left the room an instant and returned with a cabinet photograph. Hatch and the scientist looked at it together; it was unmistakably the man in the motor boat.

      “You can do nothing yourself,” said The Thinking Machine at last, and he moved as if to go. “Within a few hours we will have the guilty person. You may rest assured that your name will be in no way brought into the matter unpleasantly.”

      Hatch glanced at his companion; he thought he detected a sinister note in the soothing voice, but the face expressed nothing. Mrs. Dudley ushered them into the hall; Osaka stood at the front door. They passed out and the door closed behind them.

      Hatch started down the steps but The Thinking Machine stopped at the door and tramped up and down. The reporter turned back in astonishment. In the dim reflected light he saw the scientist’s finger raised, enjoining silence, then saw him lean forward suddenly with his ear pressed to the door. After a little he rapped gently. The door was opened by Osaka who obeyed a beckoning motion of the scientist’s hand and came out. Silently he was led off the veranda into the yard; he appeared in no way surprised.

      “Your master, Mr. Dudley, has been murdered,” declared The Thinking Machine quietly, to Osaka. “We know that Mrs. Dudley killed him,” he went on as Hatch stared, “but I have told her she is not suspected. We are not officers and cannot arrest her. Can you go with us to Boston, without the knowledge of anyone here and tell what you know of the quarrel between husband and wife to the police?”

      Osaka looked placidly into the eager face.

      “I had the honour to believe that the circumstances would not be recognized,” he said finally. “Since you know, I will go.”

      “We will drive down a little way and wait for you.”

      The Japanese disappeared into the house again. Hatch was too astounded to speak, but followed The Thinking Machine into the carry-all. It drove away a hundred yards and stopped. After a few minutes an impalpable shadow came toward them through the night. The scientist peered out as it came up.

      “Osaka?” he asked softly.

      “Yes.”

      An hour later the three men were on a train, Boston bound. Once comfortably settled the scientist turned to the Japanese.

      “Now if you will please tell me just what happened the night of the ball?” he asked, “and the incidents leading up to the disagreement between Mr. and Mrs. Dudley?”

      “He drank elaborately,” Osaka explained reluctantly, in his quaint English, “and when drinking he was brutal to the honourable lady. Twice with my own eyes I saw him strike her—once in Japan where I entered his service while they were on a wedding journey, and once here. On the night of the ball he was immeasurably intoxicated, and when he danced he fell down to the floor. The honourable lady was chagrined and angry—she had been angry before. There was some quarrel which I am not comprehensive of. They had been widely divergent for several months. It was, of course, not prominent in the presence of others.”

      “And the cut on his arm where the court plaster was applied?” asked the scientist. “Just how did he get that?”

      “It was when he fell down,” continued the Japanese. “He reached to embrace a carved chair and the carved wood cut his arm. I assisted him to his feet and the honourable lady sent me to her room to get court plaster. I acquired it from her dressing table and she placed it on the cut.”

      “That makes the evidence against her absolutely conclusive,” remarked The Thinking Machine, as if finally. There was a little pause, and then: “Do you happen to know just how Mrs. Dudley placed the body in the boat?”

      “I have not that honour,” said Osaka. “Indeed I am not comprehensive of anything that happened after the court plaster was put on except that Mr. Dudley was affected some way and went out of the house. Mrs. Dudley, too, was not in the ball room for ten minutes or so afterwards.”

      Hutchinson Hatch stared frankly into the face of The Thinking Machine; there was nothing to be read there. Still deeply thoughtful Hatch heard the brakeman bawl “Boston” and mechanically followed the scientist and Osaka out of the station into a cab. They were driven immediately to Police Headquarters. Detective Mallory was just about to go home when they entered his office.

      “It may enlighten you, Mr. Mallory,” announced

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