These must-see TV series bring bestselling books to new fans. Stephen King's novel 'The Outsider' was adapted into a miniseries by Richard Price. 'The Witcher' is based on Andrzej Sapkowski's books and not the video game series. The time jump series 'Outlander' has already adapted five of the eight published books. And although Liane Moriarty's 'Big Little Lies' is just one book, HBO expanded the story into two seasons.