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Her publisher forces Marianne to rewrite the manuscript of a novel she wrote and burned in a fit of anguish. Her obsession with her story where the characters she creates murder her own husband becomes overwhelming. She comes to believe he is leading a double life and she imagines the worst. As a matter of fact, her husband Robert is leading a double life: every day, at noon, for a year, he has locked himself up in a small hotel room to also write a novel.