There hung about her the restrained energy of a whiplash.

I've always believed in writing without a collaborator, because where two people are writing the same book, each believes he gets all the worry and only half the royalties.

There is no detective in England equal to a spinster lady of uncertain age with plenty of time on her hands.

Instinct is a marvelous thing. It can neither be explained nor ignored.

Never tell all you know—not even to the person you know best.

One is left with the horrible feeling now that war settles nothing; that to win a war is as disastrous as to lose one.

And so could you know it if you would only use the brains the good God has given you. Sometimes I really am tempted to believe that by inadvertence, He passed you by.