Mathias Freire, a psychiatrist, and Anaïs Chatelet, a homicide squad captain are connected to each other through a series of crimes inspired by Greek Mythology. United in an investigation they will have to face one another and their own demons.

Detective Yvonne is the widow of police chief Santi, a local hero in a town on the French Riviera. When she learns he was in fact a crooked cop, she tries to right his wrongs. Crossing paths with Antoine, a victim of Santi, sets off a series of wild events.

A major police operation to take down a notorious gang of bank robbers goes horribly wrong when a rooftop sniper opens fire, killing several police officers and causing an explosive distraction in which the robbers make their getaway. Commissioner Mattei launches a large-scale manhunt for the sniper and his team, and is thrown into the seedy Parisian underworld of criminals and fallen souls.