In the countryside of France, two groups of boys from the rural villages of Longeverne and Velran are in constant war against each other. Their war is a tradition that passes from father to son and without a motive but the www.xiyxi.com rivalry between the peasants. During the Algerian War in the 1960s, the Longeverne boys are led by the intelligent William Lebrac, who has been the backer of his family since his father died, while the Velrans are led by the wicked Aztec. The boys are frequently fighting with their wooden swords, throwing rotten fruits or building traps in the woods expecting to remove the buttons from the enemies' clothes. But Lebrac is coming of age and he has a crush on the girl Lanterne while his teacher Merlin offers the chance for him to have a better study in another village.

当一个人问另一个人“敢不敢”的时候，另一个人必须说“敢”，这就是游戏的规则。小男孩于连和小女孩苏菲的相遇即开始于这样一场孩童的闹剧，一个精美的铁盒子就是他们游戏的见证。说脏话，扰乱课堂，在校长室小便，内衣外穿……一个游戏两人一玩十多年，他们什么都敢，除了承认彼此相爱。 　　苏菲（玛丽昂·歌迪亚 Marion Cotillard 饰）提议两人分别四年，挑战的内容是于连（吉约姆·卡内 Guillaume Canet 饰）敢不敢伤害苏菲。恍惚四年逝去，于连找到苏菲，为了游戏的进行他决定另娶她人，邀请苏菲做伴娘。受到伤害的苏菲在于连的婚礼上抛出铁盒子“你敢悔婚么？”原本最最亲密的朋友相互伤害最深。同样心痛的两个人相约再次分别十年。 　　十年里，于连拥有了一切，家庭、事业、朋友，只是没了苏菲宛如没了心，原来丧失激情的生活这般索然无味。 　　终于十年过去，“Love me, if you dare...”

1914年8月，当德国军队在法国北部取得进展时，四名10至15岁的男孩，吕西安、卢卡斯、路易吉和路德维希在撤离孤儿院时被留下。不久，与父母失散的小女孩露丝加入了他们的行列，他们决定使用千方百计也要到达中立国瑞士，于是一场毫无准备的冒险开始了。

日理万机的商界女强人玛格列特（苏菲·玛索 Sophie Marceau 饰）精明强干，性感而极富活力。然而正值不惑之年的她，也同样面对着理想与现实、事业与家庭带给她的困惑和彷徨。40岁生日那天，玛格列特收到了一个来自老家的包裹，里面竟然是她七岁时写给未来自己的信。“亲爱的我：今天，我7岁生日，特别写封信给你，提醒你要记住，7岁时说过的承诺和我对将来的梦想……” 　　接下来的几天，玛格列特同样收到了这样的包裹。儿时那些不愉快的记忆，如潮水般汹涌而至。故事便从这些尘封着童年回忆的信件开始了。