Lee Child, author of the Jack Reacher books, has explained his biggest worry for Reacher season 3, and how the show is going to address his fears. Reacher season 3 is based on the seventh book in the series, Persuader, and sees the titular character, played by Alan Ritchson, on a mission to rescue a DEA informant as more of his past gets explored. The first three episodes are now streaming on Prime Video, while the rest of the season will air weekly on Thursdays on the platform.