Documentary filmmaker Alice Diop brings an unsettling sense of reality to her first fiction feature, which follows a novelist attending the trial of a woman accused of drowning her 15-month-old child. Based on a real-life incident of infanticide, the courtroom proceedings depicted in Saint Omer borrow from the 2016 trial of Fabienne Kabou, which Diop herself attended. In synopsis, this may sound like a lurid mix of fiction and documentary, but this precise and emotionally complex film, which sprung from Diop’s fascination with Kabou’s trial, does not have the anxiety-stoking energy of a true-crime story. It is so rooted in the point of view of Rama, the writer attending the trial, that I hesitate to describe it as a courtroom drama. The film’s dual focus—on both Rama, the writer, and Laurence, the young woman accused of infanticide—turns the trial into something other than pure spectacle and results in a story that looks closely at the frighteningly powerful bond between mother and child.