Overview
- The film adaptation debuts December 24 with Sydney Sweeney and Amanda Seyfried, directed by Paul Feig.
- McFadden, who writes under a pseudonym, is described as a Boston-area physician specializing in brain injuries.
- She visited the set, joined promotion including a New York premiere, and is credited as an executive producer.
- Publisher and press figures cite more than 35 million books sold worldwide, including roughly 12 million for the title and over 2.4 million in France.
- Editors credit TikTok-fueled reader buzz for the breakout, with French sales across the four volumes topping 5.3 million.