Between June 1940 and March 1943, the 1,200 kilometer long demarcation line broke France in two. For almost three years she controlled the daily newspaper of 40 million French people. In the north the zone occupied by Hitler's soldiers, in the south the zone administered by Marshal Pétain's Vichy regime. This film lifts the veil in this theater on the shameful mistakes of the collaboration, but also on the most courageous and noble deeds. Archive images and film recordings at places where the border used to be crossed are alternated with interviews with the last witnesses of this time.