"Anyhow," I interposed, "what difference does it make whether Sullivan used one hand or the other? One pair of handcuffs will put both hands out of commission."
As usual when one of his pet theories was attacked, Hotchkiss looked aggrieved.
"My dear sir," he expostulated, "don't you understand what bearing this has on the case? How was the murdered man lying when he was found?"
"On his back," I said promptly, "head toward the engine."
"Very well," he retorted, "and what then? Your heart lies under your fifth intercostal space, and to reach it a right-handed blow would have struck either down or directly in.
"But, gentlemen, the point of entrance for the stiletto was below the heart, striking up! As Harrington lay with his head toward the engine, a person in the aisle must have used the the left hand."
McKnight's eyes sought mine and he winked at me solemnly as I unostentatiously transferred the hat I was carrying to my right hand. Long
