French director Claire Simon, a prolific maker of fiction and documentary films, unites the two forms in her surprising latest, a precise, enveloping portrait of the complex romantic relationship between epochal experimental novelist and filmmaker Marguerite Duras and her much younger, homosexual partner, Yann Andréa. Dramatized as a pair of dialogues based entirely on transcripts from a 1982 interview between Andréa (played on screen by Swann Arlaud) and journalist Michèle Manceaux (Emmanuelle Devos, an expert interrogator and a mesmerizing listener), Simon’s film underlines the sexual imbalances and power plays that defined their fraught love life while maintaining the mysteries and ambiguities that marked Duras’s singular artistic corpus.