Police captain Laure Bertraud returns to work as she and her team begin a complex new investigation after a human torso is discovered in a pile of garbage in the 20th arrondissement in Paris. Meanwhile, a high profile criminal trial tempts ambitious lawyer Joséphine Karlsson, and Judge Roban faces a health crisis. This new season pushes every character to their limit, and forces them all to question long-standing affiliations and beliefs.

《齿轮第六季》剧情既有小清新的情节，也有残酷的一面，融入了精良的制作和走心的表演，为观众呈现了一副大情怀民国的画卷。本剧特效震撼，服装道具贴合人物形象，满足了观众审美需求。该剧核心是民国爱情励志片，主线剧情引起了许多观众的情感共鸣，支线剧情也是丰富多彩。