Surrounded by Jeff, her by-the-book deputy, JP, a guard who's always been more comfortable with inmates than colleagues, and Stéphanie, a rookie she's taken under her wing, Corinne Maillard juggles daily chaos and nitpicking management as she runs Chénoise prison's detention unit. Convinced that every detainee deserves a second chance, Corinne is perhaps the only person who truly believes that prison can change people for the better.