Judith Helfand's parents install new vinyl siding on their house in Long Island, and she turns the purchase into an investigation of what PVC plastic actually costs to make. The film follows her from that suburban driveway to the factories and communities producing the vinyl, tracing how chemicals like phthalates accumulate in bodies and ecosystems over time rather than breaking down. Interviews with environmental health researchers lay out the science of bio-accumulation and its links to cancer and birth defects, while workers and residents near production sites describe the health problems they connect to the industry. Helfand keeps the camera on her own family throughout, using her parents' reluctance to give up their new siding as a way to show how personal and stubborn this argument gets even when the evidence is on the table. The film does not stay abstract about the plastics industry; it stays fixed on one house, one family, and the substance now covering millions of others just like it.