在这部少女与战争剧情片中,诺曼底登陆的前夕，在科唐坦半岛上，一个叫玛丽的12岁少女，正准备他的第一次圣餐。但是仪式被德国人打断了，他们来逮捕牧师。绝望的玛丽穿着她的美丽的白色礼服，回到她的家——一条小船上。
那天晚上，加拿大裔美国大兵约翰在跳伞后被暴风刮走偏离方向。他来到这个家庭并寻求帮助，他需要尽快穿越雷区和沼泽。玛丽作为他的向导帮助了他。在这段路程中，他们互相逐渐了解、并建立友谊。
June 5th, 1944: On the eve of the Normandy landings in Cotentin, Mary, a 12 year old girl, is preparing for his first communion. But the ceremony is interrupted by the Germans, They came to arrest the priest. Desperate, Mary dressed in her beautiful white dress, returns home, where she lives with her parents on the river. That evening, John, a Canadian paratrooper US Army, misplaced by a violent storm arises in the family home to seek help. Lost, he must join as soon as its unity. For this it has to cross the marshes and minefields, with the help of Mary insists that as a guide. During this walk, they will get to know and establish a friendship gradually.
