When a young extremist incites death and mayhem with his homemade explosive, the call goes out to the city's top investigators – Police Captain Laure Berthaud and prosecutor Pierre Clement, renowned for their partnership and skill in the war on crime. What follows is a string of cases unlike any they've faced before, and it'll take all hands on deck from their team of crime-solvers to bring those responsible to justice. Collects the entirety of Season 4 from the internationally acclaimed thriller series.