Set in 1990s London, Popcorn explores the universal themes of family, growing up, and nostalgia. The film follows the Andretti family as they face the heart-wrenching decision of closing their beloved family-run cinema. As the young siblings, Sara and Marco, debate over the final film to be screened, their personal struggles and uncertainties about the future are unveiled, resulting in a touching portrayal of the complexities of growing up and letting go.