A young customs officer is given an important mission :to investigate drug trafficking on the Belgian border.Incognito,he goes to the place where he easily spots the gangsters.

A young customs officer is given an important mission :to investigate drug trafficking on the Belgian border.Incognito,he goes to the place where he easily spots the gangsters.Their head,Garbeau , uses not only dogs but also a tuberculous young boy to smuggle the stuff .The sick boy dies when he swims across a river.The officer pursues Garbeau and tracks him down after a long search on the roads of France .—dbdumonteil