III
　　Andrew MacWhirter was packing.
　　He laid three shirts carefully in his suitcase, and then that dark blue suit which he had remembered to fetch from the cleaners. Two suits left by two different MacWhirters had been too much for the girl in charge.
　　There was a tap on the door and he called "Come in."Audrey Strange walked in. She said: "I've come to thank you - are you packing?""Yes. I'm leaving here to-night. And sailing the day after to-morrow.""For South America?"
　　"For Chile."
　　She said: "I'll pack for you."
　　He protested, but she overbore him. He watched her as worked deftly¹ and methodically.
　　"There," she said, when she had finished. "You did that well," said MacWhirter.
　　There was a silence. Then Audrey said: "You saved my life. If you hadn't happened to see what you did see -"She broke off.
　　Then she said: "Did you realise at once that night on the cliff when you - you stopped me going over - when you said 'Go home, I'll see that you're not hanged' - did you realise then that you'd got some important evidence?""Not precisely²," said MacWhirter. "I had to think it out." "Then how could you say - what you did say?"MacWhirter always felt annoyed when he had to explain the intense simplicity³ of his thought processes.
　　"I meant just precisely that - that I intended to prevent you from being hanged."The colour came up in Audrey's cheeks.
　　"Supposing I had done it?"
　　"That would have made no difference."
　　"Did you think I had done it, then?"
　　"I didn't speculate on the matter overmuch. I was inclined to believe you were innocent, but it would have made no difference to my course of action.""And then you remembered the man on the rope?"MacWhirter was silent for a few moments. Then he cleared his throat.
　　"You may as well know, I suppose, I did not actually see a man climbing up a rope - indeed, I could not have done so, for I was up on Stark⁴ Head on Sunday night, not on Monday. I deduced what must have happened from the evidence of the suit and my suppositions were confirmed by the finding of a wet rope in the

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