1963 - Picardie, France. A group of illegal workers is dropped in the dead of night by a deserted stretch of canal near Poissons-les-Marais. One of them is a killer. For Lucas Rocco, it's the start of a case involving people smuggling, police and corporate corruption, a woman and child in peril and a vicious gang leader with one thing on his mind: the death of Lucas Rocco.