"Because he had the motive--disappointed love."
"How?"
"I don't know," Hatch confessed. "The doors of the Henley suite were closed. I don't see how anybody passed them."
"And the girl? Who killed her? How? Why?"
Disconsolately Hatch shook his head as he walked on. The Thinking Machine interpreted his silence aright.
"Don't jump at conclusions," he advised sharply. "You are confident Cabell was to blame for this--and he might have been, I don't know yet--but you can suggest nothing to show how he did it. I have told you before that imagination is half of logic."
At last the lights of the big apartment house where Henley lived came in sight. Hatch shrugged his shoulders. He had grave doubts--based on what he knew--whether The Thinking Machine would be able to see Cabell. It was nearly eleven o'clock and Cabell was to leave for the South at midnight.
"Is Mr. Cabell here?" asked the scientist of the elevator boy.
"Yes, just about to go, though. He won't see anyone."
"Hand him this note," instructed The Thinking Machine, and he scribbled something on a piece of paper. "He'll see us."