1944年3月，世界在第二次世界大战中动荡不已，而与此同时，法国一个小乡村角落里的孩子们也开始了一场“战争”。
　　一直以来，两个相邻村庄朗维村及伟恒村的孩子们冲突不断，但这一次，他们为“战争”想出了新的主意——孩子们决定互相争抢敌方身上的纽扣、鞋带、皮带等等，谁能先令对方赤身裸体被羞辱，谁就赢了。他们将这场战争命名为“纽扣的战争”。
　　“纽扣的战争”只不过是孩子们的玩闹，谁赢谁输其实并不重要。而这时，村子里来了一位犹太裔少女紫罗兰（Violette），她令朗维村的“孩子王”勒布拉克（Lebrac）心动不已，只是少女究竟来自何方？她背后又隐藏着怎样的故事？

　　A deserted pond. Two lonely children fall under the spell of this wild place that, little by little, draws them closer to each other and gives them the strength to cope with life. Seen through their eyes, and through their imaginations, the pond becomes a secret kingdom, both marvellous and frightening, thronging with creatures born from dreams or nightmares. The children experience an initiation, brief and intense, from which they will emerge transformed.