Discover the Secrets to Getting Published. Writing a book? In the beginning stages of writing a book, most people start with a blank page and write their entire manuscript. According to author and acquisitions editor W. Terry Whalin, this approach is backwards. About 80% to 90% of nonfiction books are sold from a book proposal. This mysterious document called a proposal contains many elements that will never appear in a manuscript-yet these details are critical to publishing executives who make the decision about publishing or rejecting an author's project. In Book Proposals That Sell, Terry reveals 21 secrets to creating a book proposal that every author needs in order to create one that sells.