“The essence of a detective story,” I said, “is to have a rare poison—if possible something from South America, that nobody has ever heard of—something that one obscure tribe of savages use to poison their arrows with. Death is instantaneous, and Western science is powerless to detect it. Is that the kind of thing you mean?” “Yes. Is there really such a thing?” I shook my head regretfully. “I’m afraid there isn’t. There’s curare, of course.” I told her a good deal about curare, but she seemed to have lost interest once more. She asked me if I had any in my poison cupboard, and when I replied
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