At the start of high school, Piper, Sophie, Isabella and Honor think they will be best friends forever, so they sink a time capsule in the lake with a list of things they want to do before graduation. By senior year, they have gone their separate ways. Piper has turned into the class clown, party girl who never passes up a drink. Sophie pledges to stay a virgin until she is married and has created a purity app. Isabella is the feminist femme fatale who's the editor of a zine. And Honor is the pride and joy of the community. Her dream of being a professional ballerina is taking off. But when tragedy strikes, the former BFFs must reunite, break open the capsule and complete the pre-graduation bucket list.
莱拉(凯丽•拉塞尔 Keri Russell 饰),一个出色的大提琴手;路易斯(乔纳森•莱斯•梅耶斯 Jonathan Rhys Meyers 饰),一名流浪的爱尔兰歌手。一个月色迷离的晚上,两人相遇了。度过难忘的一晚后,莱拉那专横的父亲又强逼她继续踏上音乐会的旅程。路易斯因等不到恋人失望之下离开了;而莱拉发觉爱人走后,独自伤心的等待肚中的孩子出生。岂料几个月后莱拉遭遇了一场车祸,宝宝亦随之夭折。孰料,莱拉的宝宝其实并没有死,而是被她狠心的父亲送到了孤儿院。一晃眼10多年过去了,生活在孤儿院的少年奥古斯特(弗莱迪•海默 Freddie Highmore 饰)坚信自己的父母还在世上,于是踏上了漫漫寻亲路。