On the evening of the Kennedy assassination, Jim MacLaine (David Essex) visits his friend Mike Menary (Adam Faith) at the funfair where Mike works. Jim tells Mike he's joined a touring rock group called the Stray Cats and invites Mike to come along as their road manager, pointing out that Mike could make millions if the group succeeds. Mike accepts and proves to be a shrewd operator, arranging a better van, accommodations, and a recording session for the group. Privately, Mike tells Jim that arrogant singer/ guitarist Johnny (Paul Nicholas) must go in order for the band to be a success. Largely through Mike's efforts, the Stray Cats have their first hit single with a song sung by Jim, even though it was released as the B-side to a song sung by Johnny. Jim becomes the new center of attention for fans and press, causing the jealous Johnny to leave the band.