Marianne Winckler, a well-known author, decides to live in northern France to research for her new book on the subject of job insecurity. Without revealing her true identity, she gets hired as a cleaner, working with a group of other women. She experiences financial instability and social invisibility first-hand. The harshness of the conditions does not hinder, instead aids the sense of solidarity among the group, but will the trust remain intact when the truth comes out? Shown as the opening film of the Cannes Directors' Fortnight section, Between Two Worlds is based on French journalist Florence Aubenas's bestselling non-fiction work Le Quai de Ouistreham, which investigates rising precarity in French society through her actual undercover experiences.