赛尔(萨姆·赖利 Sam Riley 饰) 是一个追寻灵感，渴望遨游的年轻作家，迪安·莫里亚蒂（加内特·赫德兰 Garrett Hedlund 饰）则是个风流率性，曾几进监狱的不安少年，还娶了16岁的浪荡姑娘玛丽露（克里斯汀·斯图尔特 Kristen Stewart 饰）为妻。然而赛尔十分喜欢迪安充满激情的生活，迪安则钦佩赛尔的风度与学识，三个迷恋自由的年轻人结识后，很快便决定抛下生活，一同行走在路上。他们一路搭便车，吸大麻，行时高歌，醉时沉思。在穿越美国东西的大道上，放浪形骸，追寻自我，燃烧青春。 　　影片改编自美国作家杰克·凯鲁亚克的自传性同名小说，该小说被奉为“跨掉的一代”的圣经。Shaken by the death of his father and discouraged by his stalled career, writer Sal Paradise goes on a road trip hoping for inspiration. While traveling, he is befriended by charismatic and fearless Dean Moriarty and Moriarty's free-spirited and seductive young wife, Marylou. Traveling across the American southwest together, they strive to break from conformity and and search the unknown, and their decisions change the very course of their lives.