The term nonfiction might conjure up images of dusty history tomes, but the genre is remarkably varied, encompassing everything from memoirs to cultural essays about Friends. The best nonfiction books of 2019 represent the genre in all of its eclectic glory. There are tell-all celebrity memoirs, harrowing true stories, and at least one deep dive into the history of the high heel shoe. Whether you're obsessed with true crime or Disneyland, 2019 offered up a book that turned the subject on its head. Read on to discover the 45 best nonfiction books of 2019 that kept us reading way past our bedtimes all year long.