Gunpowder and cocaine make uncomfortable companions. A love affair over the mortars and Roman candles is disrupted by the imaginative schemes of a biker gang boss. Julia, granddaughter of a commercial pyrotechnician, falls for Rocco, sixth generation scion of a competing firework company, only to discover that her innocent romantic partner has been drawn into a network of drug-traffickers through coercion and blackmail. Meanwhile, activists with a strange agenda are attempting to disrupt firework shows and are leading the police in frustrating circles. Sabotage, subterfuge, police raids, mix-ups and theft lead through an intricate gunpowder plot to an explosive thunderclap of a finale.