The agent’s answer
Relative to its length, Kelly calls the overview the proposal's heaviest lift: six to ten pages in first person that has to distill the entire pitch, so that an editor reading only this section still comes away with the whole picture of the book, the author, the audience, and the market. She anchors the tone advice in something concrete and familiar, telling writers to think back to the five-paragraph persuasive essay from school, since a proposal has the same job of persuading publishers that the idea has market viability. She notes people tend to have polarized experiences with this section, saying it is where writers have the most success writing first, or writing last.