I recently learned of this neat site, the Page 99 Test, where readers are given only a single page from a book (can you guess the page?) without knowing what book it is from, and from there they rate the book and their potential interest, as well as have the options to write some comments. Readers then are are told what the book is as well as given links to Amazon should they be interested in purchasing it.
I put up a page from both “The Year We Finally Solved Everything” and “The Adventures of Whatley Tupper.” It’s a cool little experiment, and I enjoy getting the occasional feedback. If you’re an author, I recommend putting up your own page 99 sample and seeing what happens.