One question to make your novel sell: DOES IT TURN?

Illustration by Makenna Alyse

I wish somebody told me this when I started writing. I wish somebody explained to me why some books sell, and some don't. I wish there was a manual written for every beginning writer that was something like Writing 101. I wish it were easy to learn the very simple truths I'm learning after blindly stumbling around for four years,teaching all of this to myself on my own. I'm happy that's it's only been four years, and not fourteen, or forty, which is the case w...