According to data of book sales as tracked by Nielsen Bookscan and and analyzed by Publishers Lunch, Harper Lee’s long awaited novel Go Set a Watchman topped the list of 2015’s Top 15 Fiction with sales of 1,599,000 copies. To Kill a Mockingbird, Lee’s Pulitizer Prize-winning novel first published in 1960 and a classic of modern American literature, sold 563,000 copies and made the list at number 7. F. Scott Fitzgerald’s The Great Gatsby, another literary classic, ranked 13 selling 297,000 copies, proving that classics never go out of style.