Through the use of verité footage and intimate interviews, this documentary feature film follows a riverkeeper's lawsuit against a corporate landfill poisoning the Susquehanna River with PFAS “forever chemicals." Along its banks, an archaeologist uncovers ancient petroglyphs, a Passamaquoddy educator reclaims her heritage, historians trace freedom routes along the Underground Railroad, and a celebrated painter captures the river's fading beauty—together forming a movement to save a waterway that carries centuries of American history before it's lost forever.