在20世纪70年代的漫长炎热的夏天，四个男孩在一个被忽视的乡村天堂中自由漫步，直到一场悲剧袭击使他们对抗成人世界并永远改变他们的生活。
影片围绕间谍小说作家叶利·康韦（布莱丝·达拉斯·霍华德 Bryce Dallas Howard 饰）的作品展开。叶利的小说讲述神秘特工阿盖尔（亨利·卡维尔 Henry Cavill 饰）及其瓦解全球间谍集团的任务，而小说中的情节却意外开始与真实间谍组织的秘密行动出现惊人 的一致。在特工艾登（山姆·洛克威尔 Sam Rockwell 饰）的陪同下，叶利带着猫咪阿尔菲（Chip 饰）穿越世界，竭力赶在间谍组织的杀手们行动之前化解危机，此时小说的虚构世界与现实之间的界限开始变得模糊不清。随之而来的是一场跨越全球的冒险。
Two sisters living separate lives on different continents are reunited on a Mediterranean Island. The two barely have time to bond and revive family ties as Kate, the elder, meets a group of locals and agrees to an exciting ride on a hot air balloon. But disaster strikes and as the result of a freak accident, the balloon is carried far out to sea. Their cell phones out of range, and the balloon running out of gas, Kate and her friends are battling for their lives. While, back on land, the younger sister, Liz, has become an unwanted "material witness" to a crime. Matters then take a dramatic twist, one that will mark their lives forever.
