In a quiet French neighborhood, the life of a family is suddenly disrupted when a mysterious outsider, harboring a dark secret, moves into the house next door. As the family becomes immersed in their daily routine, they begin to notice strange and disturbing behaviors surrounding the new neighbor. The atmosphere becomes tense when they discover that the outsider is linked to a series of unsolved crimes that have shaken the tranquility of their small community.
The mother, an intuitive and protective woman, grows suspicious of this stranger and starts to investigate his past. In her efforts to uncover the truth, she becomes entangled in a dark web of lies and deceit that leads her to question not only her neighbor but also her own family. Meanwhile, the father, caught between his desire to protect his loved ones and his skepticism towards his wife's concerns, becomes a battleground of emotions.
The tension escalates when the family's children seem to attract the attention of the outsider, culminating in a climax that confronts the characters with their deepest fears. The film is a fascinating study of suburban paranoia and the shadows that often lurk behind what appears to be a normal life. Get ready for a psychological thriller that will leave everyone on the edge of their seats!