About 250-300 words, the review includes a summary to give readers context, together with a concise, unbiased opinion that can be positive, negative, or, most commonly, mixed. Each review details a general sense of a book’s worth. The review also includes specific information about the book's strengths and weaknesses. Whether positive, negative, a mix of both, you'll always have the choice of keeping the review private and use it to improve your manuscript. Otherwise, you can publish the review and use it to market your book to readers.