Western powers plan to explode a hydrogen bomb in a remote area of Southern Algeria - code named Zone Zero. The zone has to be evacuated. Fort Ney is the smallest Foreign Legion outpost in the zone, commanded by a young lieutenant. Here, too, is the English legionnaire, tortured by previous cowardice, as well as a little Greek who has within him the spark of greatness. It has always been a peaceful place - until the twelve travellers arrive. Now the outwitted garrison faces the uttermost limit of horror...