"One of them was. See, somebody had put a poisoned one in among the others."
"That leads back to Thorpe, who else could do that?"
"And we don't know that anybody did, only it might have been."
"Can you smell any prussic acid in the vial?"
"No," and Zizi sniffed at it, "I seem to think I do, but I daresay it's my vivid imagination. Do you suppose a chemist could discern any?"
"Probably not, but we might make a try at it. Pretty slim clue, anyway, Ziz."
"I know it, but I have a hunch it's the real thing. You see, Blair was in the habit of taking these things——"
"How do you know?"
"Carlotta Harper told me. I've quizzed her a lot about Mr. Blair's personal habits, and he always carried soda mints in his pocket, and took one now and then. So, as there was no soda mint bottle found in his pockets, and this was in the basket, it's a logical deduction that he finished this bottle that night that he died. And they all think the poison was given to him through some simple trick, so why not this?"
"It may be. It very likely is. But where does it get us?"