In 1960, two legendary couples stayed at the Beverly Hills Hotel in Los Angeles. Simone Signoret and Yves Montand stayed in bungalow 20: they loved each other, they were beautiful, still young, full of life, at the height of their fame. But Marilyn Monroe, staying in the neighboring bungalow, was an irresistible woman whose relationship with writer Arthur Miller was on the rocks. Simone became friends with Marilyn, while Yves filmed with her, trying to resist her seduction. Unfortunately, Arthur...