I stumbled across this looking for to improve my French, I've ended up being gripped by the characters. There is a unifying theme but every week there is more blood and seediness and sub-plotted nastiness. It's enough to put one off Paris, however, you do get a vivid impression of reality as in "NYPD" and such work as Steve Bochco is famous for. The photographic effect is nearly monochrome, in keeping with the subject matter. Believe me this not a laugh a minute show, but it is a correction to the romantic view of France that Francophiles like me have. As a cop show it works, although there are enormous differences in legal procedures from those I know. There is also a cynical view of the wielding of power, both judicial and political. Aside from the action there is an indefinable Parisian gloss on the actors, it's no wonder falling into bed happens so easily, all the main leads are good looking and even the cops have a certain "je ne sais quoi".I am hooked on this series to find out what is going to happen to the main characters both good and bad.