Nox - Season 1 (2018)

During a police operation in the underground Paris, the young lieutenant Julie Susini disappears. A Search is organized. Julie's mother, Catherine, a retired cop with a difficult relationship, decides to conduct her own investigation. The help comes from the daughter teammate Raphael Berger.

The police investigate a mass grave discovered by Catherine and Raphael. Divisional Commissioner Garraud calls the Quarry and Underground Intervention Brigade for help to this matter. Missing clues, Catherine seeks a track in the past of Julie and wonders what could push her daughter to resign.

Catherine and Raphael discovered that Julie was followed. A second mass grave is unearthed. Unlike the first, this one contains recent corpses. It's now obvious that a killer is raging in the Paris underground. Raphael is summoned to the IGPN.