As I prepare the third Nicole Tang Noonan mystery for publication, I am thinking about how the series will sell on Amazon. For one thing, the books must look good when shoppers use the "Look Inside" feature.
That means the potential reader must see Nicole discover the murder at the end of about twenty pages. With this in mind, I checked my new book and saw the murder was discovered on page thirty-one.
So I picked up my pen and marked everything that could possibly be removed from those pages or postponed until later in the story. I found that by doing so I could make the murder visible in "Look Inside."
I don't mind rewriting for the sake of marketing. Writers have always had to do so, especially writers of genre fiction.
By the way, traditionally there is no hard and fast rule about when the murder must be discovered. Agatha Christie puts the murder on page forty of The Murder at the Vicarage. Of course, she wasn't publishing on Amazon.