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First day at Dante Prison for Alice, a model student, daughter of Chinese immigrants, convinced that she has no place there and that she will be quickly released to join her mother undergoing chemotherapy and take the entrance exam for Sciences Po. But as soon as she arrives, she makes a series of missteps, attracts enemies and finds herself trapped with hashish on her by Audrey, a guard who gives her the choice: become a snitch or stay in jail. So, when she hears Killian, Gabin and Hacine talking about escaping, Alice decides to join the plan to better denounce them and earn her release. A total control freak, she launches into a race against time and a dangerous double game in the prison environment.