WISDOM FROM BOOKS & COMICS

Agatha Christie in The Murder of Roger Ackroyd 

'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?