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Engrenages (literally "cogs" or "gears"), known in English-speaking markets as Spiral, is a French procedural Crime and Punishment Series set in the less touristy parts of Paris. The three main protagonists play different roles in the French justice system: Capitaine Laure Berthaud represents the police, Maitre Pierre Clément is a prosecutor, and François Roban is an examining magistrate.

The first season deals with the murder of a Romanian prostitute that turns out to have heavy political connections. The second season covers an investigation into a group of North African gangsters. Both of these two seasons also have Mystery of the Week elements, but the third season dumps this in favour of putting the three characters into separate plot arcs: Berthaud hunts a Serial Killer of prostitutes in Paris's former abbatoir district; Clément, disgusted with politics and corruption, attempts to set up as an independent lawyer; and Roban starts a quixotic investigation into a corrupt mayor with very high-level connections.

The show has proved so successful that three more seasons have been ordered simultaneously.

This show provides examples of:

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