ing facts about it. For instance, it was something that the murderer had not been able to take away with him at the time that he committed the crime. At the same time it was vital that it should be removed as soon as possible after the crime had been discovered. And so—the telephone message, and the opportunity for the murderer to be on the spot when the body was discovered.
"Now four people were on the scene before the police arrived. Yourself, Parker, Major Blunt, and Mr. Raymond. Parker I eliminated at once, since at whatever time the crime was discovered, he was the one person certain to be on the spot. Also it was he who told me of the pulled-out chair. Parker, then, was cleared (of the murder, that is. I still thought it possible that he had been blackmailing Mrs. Ferrars). Raymond and Blunt, however, remained under suspicion since, if the crime had been discovered in the early hours of the morning, it was quite possible that they might have arrived on the scene too late to prevent the object on the round table being discovered.
"Now what was that object? You heard my arguments to-night in reference to the scrap of conversation overheard? As soon as I learned that a representative of a dictaphone company had called, the idea of a dictaphone took root in my mind. You heard what I said in this room not half an hour ago? They all agreed with my theory—but one vital fact seems to have escaped them. Granted that a dictaphone was being used by Mr. Ackroyd that night—why was no dictaphone found?"
"I never thought of that," I said.
[293]
