Courtesy Quick, give us an answer: should you read the book before you see the movie, or should you see the movie and then dive into the book? It’s a heated debate as old as time—and one with no right answer—but luckily, 2021 comes bearing plenty of cinematic offerings on which we can all test out best practices. We’ve taken the liberty of rounding up the year’s best and brightest book to movie adaptations, from cozy period pieces to black comedies and horror thrillers. Some of these films are already out, meaning that you can stream them now and tackle that whole book part later, if that's your thing. Others will surface later this year, so while you eagerly await their release dates, you may as well dive into the books for a sneak preview.