The trouble with psychology is that it doesn't take human nature into account.

There are only two periods in a woman's life when she hopes to be taken for older than she is, under sixteen and over ninety.

I try, and I think I succeed, in making my readers feel sorry for my psychopaths, because I do.

To say that Agatha Christie’s characters are cardboard cut-outs is an insult to cardboard cut-outs.

The trouble with psychology is that it doesn't take human nature into account.

Maybe being married is talking to oneself with one's other self listening.

I've had two proposals since I've been a widow. I am a wonderful catch, you know. I have a lot of money.