People who can be very good can be very bad too.
I specialize in murders of quiet, domestic interest.
Everyone likes talking about himself. - Hercule Poirot
If I were at any time to set out on a career of deceit, it would be of Miss Marple that I should be afraid.
I am not one to rely upon the expert procedure. It is the psychology I seek, not the fingerprint or the cigarette ash.
Our weapon is our knowledge. But remember, it may be a knowledge we may not know that we possess.