"All outward appearances point to the fact that death is due to strangulation." At that moment the police officer entered the room. "I have taken the liberty, Mr. Standerton," he said, "of locking the door of the room and retaining the key in my possession. It will be necessary for me to report the matter to the Authorities at once, in order that an Inquest may be held. Before I do so, however, may I put one or two questions to you?" "As many as you like," Jim replied. "I am, of course, more than anxious that the mystery surrounding my father's death shall be cleared up at once, and the murderer brought to Justice." "In the first place," said the officer, "I see that the window of the bedroom is securely fastened on the inside, so that the assassin, whoever he was, could not have made his entrance by this means. Do you know whether your father was in the habit of locking his door at night?" "I am sure he was not. A man who has led the sort of life he has done for fifty years does not lock his bedroom door on retiring to rest." "In that case the murderer must have obtained access to the room through the house, and I must make it my business to ascertain whether any of the windows or doors were open this morning. One more question, Mr. Standerton, and I have finished for the present. Have you any reason to suppose that your father had an enemy?" Jim remembered the suspicion that had been in his mind ever since he had made the ghastly discovery that morning. "I have," he answered. "There was a man in Australia who hated my father with an undying hatred." "Forgive my saying so, but a man in Australia could scarcely have committed murder in England last night." "But the man is not in Australia now. He was here yesterday evening, and he and my father had a quarrel. The man was ordered out of the house, and went away declaring that, whatever it might cost, he would be revenged." "In that case it looks as if the mystery were explained. I must make it my business to discover the whereabouts of the man you mention." "He was staying at the 'George and Dragon' yesterday," said Jim. "By this time, however, he has probably left the neighbourhood. It should not be difficult to trace him, however;