Hélène Noris, a young Belgian woman from a bourgeois family, is haunted by a past affair with Tamara — now married to her father. Torn between desire and resentment toward Tamara’s conformist life, Hélène feels alienated in the provincial world she inhabits. To boost his social image, her stepfather René invites Parisian director Jean Gerfaud to stage an avant-garde version of Tartuffe. Tamara flirts with him, but Hélène seduces him first. A passionate, destructive affair begins, entangling love, jealousy, and ambition. When the play’s scandalous premiere sparks outrage, Jean marries Hélène, provoking Tamara’s fury. Yet Hélène, restless and defiant, betrays him with a soldier. In rage and humiliation, Jean confronts her in the “red room,” the space that once embodied their love and now their ruin.

When a government official disappears in the London tunnels, after several reports of missing people in the same location, Scotland Yard start to take the matter seriously, along with a couple who stumble into a victim by accident.