For the first time ever, prolific horror scribe Stephen King (photo) has penned a screenplay based on another writer’s book. King has written a film adaptation of Patrick McGrath’s 1998 novel “Asylum” for Paramount Pictures, Variety reported. The story is set in an English insane asylum, where the superintendent’s wife has an affair with a patient who turns out to be a murderer. Liam Neeson and Natasha Richardson plan to star with Jonathan Demme directing. King wrote the script for several movie adaptations of his books, including “Pet Sematary” and “The Stand.”