It's a very confusing experience living as a woman in Japan. If your husband is white-collar, the wife is blue. Even if you marry a person of status, the wife inevitably remains a rung below.
A crime is like a crack in reality, and it is the author's role to explore those cracks. As a writer, I like to see how they impinge on people.
The thing I don't like about detective stories is looking for criminals.