The Outlander book series by Diana Gabaldon, which has sold millions of copies, inspired the popular TV show. The series follows the epic love story between nurse Claire Randall and Highlander Jamie Fraser. The books blend genres such as romance, action, fantasy, and historical fiction. The TV show has gained a massive fanbase since its release in 2014. The series is faithful to the books, with each season corresponding to a book in the series. Gabaldon has stated that the upcoming tenth book will be the last. The book series also includes spinoffs and short stories.