Unless you are good at guessing, it is not much use being a detective. - Agatha Christie

I have, perhaps, too professional a point of view where deaths are concerned. They are divided, in my mind, into two classes — deaths which are my affair and deaths which are not my affair — and though the latter class is infinitely more numerous — nevertheless whenever I come in contact with death I am like the dog who lifts his head and sniffs the scent.

I avoided my own friends and acquaintances, yet the loneliness of my existence was insupportable.

Sometimes I feel sure he is as mad as a hatter and then, just as he is at his maddest, I find there is a method in his madness.