Prime Video used its San Diego Comic-Con panel to reveal that the Reacher franchise is expanding beyond television, with Frances Neagley set to receive her own standalone novel. Actress Maria Sten, who has portrayed Neagley since the first season of Reacher, announced the news to the Ballroom 20 audience alongside new footage from Reacher Season 4 and the character's forthcoming TV spin-off, Neagley. The move marks a first for the franchise and reflects how central the character has become to the wider Reacher universe.

The novel, titled Zero Margin, is being written by original Reacher author Lee Child in collaboration with Yasmin Angoe, and is scheduled for release in March 2027. Neagley's role was expanded significantly for the screen versions because Jack Reacher's internal monologue-driven style of storytelling does not translate easily to television, making her a useful vehicle for exposition. She has since appeared in all three television seasons and is now getting both her own series and her own book.