The unidentified body of a homeless man is found on a dune in the Bay of Somme. Killed by a shotgun bullet... fired in the back. Pure accident? Concealed homicide? Intentional murder otherwise known as "assassination"? The local Gendarmerie Brigade is in charge of the case, under the direction of Substitute Aurore Debac. To investigate the death of the vagrant from the Bay of Somme, Aurore relies on the stubbornness of a major of the gendarmerie, with extraordinary methods, Paul Beaujour, freshly landed, and who knows nothing about the codes of the region…