Things are finally looking up for Rosie: she's debt-free, or at least almost, her trailer is in great condition, and she even has time to take her three kids on a Christmas vacation. But she knows the smooth sailing can't last. Rosie is always there for a friend in need, and before she knows it, she has her hands full. Again. To cover for her best friend, Véro, she fills in as housekeeper for a renowned psychoanalyst. On top of that, pal Mimi calls to say she's landed in the hospital, so Rosie agrees to take care of her rebellious teenage son, Léo. When Rosie sees a teenage girl who seems to be in trouble, she enlists Léo's help to investigate. Funny and suspenseful, Rosie Maldonne's third investigation returns to the criminal underworld of southern France.