The only clue to what is in people's minds is in their behavior. If a man behaves strangely, oddly, is not himself--Then you suspect him?No. That is just what I mean. A man whose mind is evil and whose intentions are evil is conscious of that fact and he knows that he must conceal it all costs. He dare not, therefore, afford any unusual behavior.
Agatha Christie, Death Comes as the End
behavior, change, good-vs-evil