The Unknown Girl

La fille inconnue is a movie starring Adèle Haenel, Olivier Bonnaud, and Jérémie Renier. A female doctor gets obsessed with the case of a dead woman after learning that the woman had died shortly after having rung her door for help.
Jenny, a young doctor who feels guilty after a young woman she refused to see winds up dead a few days later, decides to find out who the girl was, after the police can't identify the young woman.