It is an episode from the first season of this very long TV show. The first season was certainly not the best of the whole series, maybe because there was much humor in it. That changed in the next seasons. Here our lead cop investigates after explosions that occured in official buildings. It is obviously inspired from the Carlos - the terrorist - case that brought terror in Paris during the late seventies. It shows how naive young people are manipulated by the lead terrorists. That's the main message in this story. Not bad.