When Martin Luxford leaves jail, he decides to form a swing band, having been taught to play the saxophone by his cellmate Jack. Returning to his native Liverpool, Martin pulls together a backing band of misfits and loners, and recruits his ex-girlfriend Joan as a singer. Things are complicated somewhat by the fact that Joan is now married to the policeman who arrested Martin, and when the band's first gig - at a heavy metal pub - goes badly, it seems as though the road to musical success may be a rocky one.