Everything you wanted to know about a person was written in the face, she believed. It's not that she believed that the shape of the head was what counted– even if there were many who still clung to that belief; it was more a question of taking care to scrutinise the lines and the general look. And the eyes, of course; they were very important. The eyes allowed you to see right into a person, to penetrate their very essence, and that was why people with something to hide wore sunglasses indoors. They were the ones you had to watch very carefully.

The No. 1 Ladies' Detective Agency, chapter 1 - The No. 1 Ladies' Detective Agency series