Pretty Little Liars #3: Perfect is a young adult fiction novel by Sara Shepard, published by HarperCollins in 2008. The book is a trade paperback with 336 pages, measuring 8 inches in length, 5.3 inches in width, and 0.8 inches in height. It weighs 9.3 ounces and is written in English. The novel is the third installment in the Pretty Little Liars series and features themes of school, friendship, romance, and mystery.