Firmly based on the realistic realm of how modern day intelligence services collect human intelligence via old fashion infiltration. This is a binge watch series, regardless of it being in French. Anyone interested in getting a realistic insight of how any intelligence agency operates in today's chaotic international political climate should give this series a proper try by watching several episodes. You will undoubtedly be thoroughly sucked into this psychological spy thriller which could easily be based on factual true events without the Hollywood story telling exagerations of unrealistic plot lines and explosions some leading to end of world doomsday scenarios. This fascinating series depicts the day to day dangerous and tedious grunt work intelligence services endure. It also depicts the interaction between the intelligence services of various countries and the often entangled interactions between them by using leverage on one another even when the countries are close allies. THIS IS A MUST WATCH!!!! This is mission impossible and james bond series firmly grounded in real world spying. Enjoy!!!