The story centers on Matthew, an American film student adrift in Paris, who becomes drawn into the orbit of twins Isabelle and Theo — passionate, provocative siblings who live and breathe movies. What begins as curious hospitality soon blurs into a claustrophobic, dangerously magnetic ménage à trois. Bertolucci stages their games as both playful study and power play, turning the apartment into a rehearsal space for desire, ideology, and identity.