A musical biopic of the Four Seasons—the rise, the tough times and personal clashes, and the ultimate triumph of a group of friends whose music became symbolic of a generation. Far from a mere tribute concert, it gets to the heart of the relationships at the centre of the group, with a special focus on frontman Frankie Valli, the small kid with the big falsetto.

Frank (Danny Fendley) spent five years in prison for refusing to rat on his boss, Xavier (Joe Estevez). While he was locked up, Xavier inexplicably had Frank's girlfriend killed and took his cash; now that he's out, Frank wants payback. He finds his former employer, but at the same time realizes Xavier's about to do the same thing to another innocent victim. Can Frank exact revenge and save the girl from Xavier's clutches before it's too late?