A closer look at “Slow Horses Faces Game of Thrones' Source Material Problem, But Here's Why It Will Be Fine”, exactly as the source publishes it. Apple TV+'s acclaimed spy series Slow Horses is approaching a familiar challenge: the source material is running out. Author Mick Herron has written eight novels and novellas in the Slough House series, with a ninth on the way, but the show is catching up fast. This is the same issue that plagued Game of Thrones, which outpaced George R.R. Martin's books and suffered a controversial ending.
However, Slow Horses is better positioned to avoid that fate. Herron is actively writing, with the next book expected before the series catches up, and the show's structure—each season adapts one book—allows for natural breathing room. The creative team, including showrunner Will Smith and star Gary Oldman, has proven adept at expanding the world without losing the source material's sharp wit and character depth. This listing links straight to the original page, where the content is available in full.