Fireworks displays start not with the explosion but with recipes kept as closely guarded as any industrial secret, and this film gets access to two of the people who hold them: the Zambelli family of New Castle, Pennsylvania, in the business for more than 125 years, and the chemists and rocket scientists at Los Alamos who study the chemistry behind the color and timing. The film opens with a short account of fireworks' origins in ancient China before moving into the modern industry, tracing the Zambellis from itinerant peddlers to one of the largest pyrotechnic companies in the world. Footage ranges from small community shows to the scale of the Macy's Fourth of July Fireworks Spectacular, with the mechanics of shells, fuses, and chemical compounds explained alongside the show footage. Interviews describe how the tightly knit community of pyrotechnic showmen trades techniques and pushes each other toward more elaborate displays. The result pairs the visual spectacle with the physics and chemistry that produce it, and the family history that has kept one name at the center of the industry for over a century.