科学家们发现，宇宙中的两颗彗星正在急速向地球逼近，不出意外的话，它们终将撞上地球，给地球带来无法估量的损失。为了避免造成世界级的恐慌，政府封锁了这一消息，偷偷在格陵兰岛建造了非常坚固的堡垒，只有躲进堡垒的人们才能够获得一线生机，而进入堡垒的条件非常的苛刻。
　　杰夫（杰拉德·巴特勒 Gerard Butler 饰）是一名建筑工程师，他得到了进入堡垒的机会，于是决定带着妻子艾莉森（莫瑞娜·巴卡琳 Morena Baccarin 饰）和儿子内森（罗杰·戴尔·弗洛伊德 Roger Dale Floyd 饰）一起前往格陵兰岛。哪知道旅途进行到一半，察觉到了事件真相的军方开始了暴乱行动。

　　Based on a best-selling book by New York Times national security correspondent David E. Sanger, The Perfect Weapon explores the rise of cyber conflict as the primary way nations now compete with and sabotage one another.
　　Directed by Emmy-winning filmmaker John Maggio (Panic: The Untold Story of the 2008 Financial Crisis) and featuring interviews with top military, intelligence, and political officials on the frontlines of cyberterrorism, the documentary brings to light the combatants and innocent victims caught in the crosshairs of a hidden war that has been going on for decades — a war that America started, but has no idea how to finish.
　　Traveling from the deserts of Iran and Las Vegas to the back alleys of Beijing and Moscow, the film chronicles America's pursuit of enemies who have plotted against its institutions, its economy, and its democracy. A never-before-seen look inside the secret world of spies, hackers, and scammers in the lead-up to the 2020 U.S. elections, for which fear of cyberattacks has mounted to an all-time high, The Perfect Weapon is a timely reflection on the ultimate price — and potential "victors" — of this high-stakes conflict.

　　故事发生在美国内战结束不久之后，曾经在前线奋勇杀敌的军官基德上尉（汤姆·汉克斯 Tom Hanks 饰）如今成为了一名读报人。他辗转于一个又一个小镇，为生活在那里的居民们带来来自世界各地的最新的消息。
　　一天，基德在德州遇见了一个名叫乔安娜（海伦娜·泽格尔 Helena Zengel 饰）的小女孩，这个可怜的姑娘在6年前被印第安人掳走抚养，如今，重新获得了自由的她将要回到叔叔和阿姨的身边开始正常人的生活，虽然这并不是乔安娜真正想要的。基德和乔安娜之间产生了一种奇妙的联结，于是，基德答应护送乔安娜去她应该去的地方，两人要共同面对的，除了险恶的自然环境外，还有叵测的人心。