1. Many, if not most, nonfiction books are sold to publishers as book proposals.

Juliet, a development coordinator at a major nonprofit, has a nonfiction book idea. After years of being resigned to flats, she has trained herself to glide in heels across the roughest terrain: cracked sidewalks, dirty subway steps, and lawns formerly occupied by Canadian geese. She has insights that she wants to share to what she’s sure is a vast audience of flat-wearers desperate to prowl the world on heels. R...