Short answers to whether a film or series comes from a novel, comic, memoir, true story or an original script, plus what to read first. Some answers are no: pages say so when a show is an original screenplay or a case of two works sharing a title.

Novels adapted for TV. Station Eleven , Normal People , The Expanse , The Wheel of Time and The Rings of Power .

Comics, manga and games. The Boys , Sweet Tooth , Death Note and The Last of Us .

True stories and nonfiction. The Serpent and Conversations with a Killer .

No single source book. Unforgotten and We Are Lady Parts .

For print editions, the movie tie-in versus novelization guide uses the author, publisher description and ISBN to distinguish an original-novel reissue from an adaptation into novel form.

Before choosing the source text, the Hobbit graphic-novel and illustrated-book comparison distinguishes David Wenzel’s abridged graphic adaptation from a full-text illustrated edition using publisher records.