Marie-Line is juggling between odd jobs to support her agoraphobic father. Despite the precariousness of their lifestyle, she remains a lively and cheerful young woman. Yet, after a series of unfortunate events, she is fired from her job and sentenced by a judge to a small penalty. A few days later, this very judge will be in a position to help her get back on track – a chance for Marie-Line but also the beginning of an unlikely friendship.

A mummified corpse has been found by workers who were knocking down a wall. Ariane Sallès and Gaspard Lesage are in charge of the investigation.