The movie takes place at the end of WWII. German troops are giving up their positions and the fierce fighting is nearing its end. Five American soldiers are ordered to guard an ancient castle located in France. This place was a camp for the Germans, but they quickly left the shelter. The heroes are sure that this assignment will be a kind of vacation for them and a well-deserved rest from the bloody battles. They are looking forward to a great time and are confident that their lives are not in danger, because there are no more enemies in the area. But they do not even suspect that they will face something more terrible than the enemy on the battlefield...