After a meltdown, a demoted detective is given the opportunity to go undercover and take down the mob's most ruthless killer, but his life and only chance at redemption spiral out of control as he loses himself in the role.

根据同名音乐剧改编，讲述了20世纪60年代四个新泽西州工人阶级出身的男孩追求美国梦的故事，他们在成长和追求梦想的过程中屡遭挫折，友谊经过多次患难与磨练，最终编写了属于他们自己风格的音乐，组成了风靡几代人的四季乐队。