Twelve-year-old Eliza and her sister Avery have lived their entire lives in a small fishing village on the coast of Louisiana, growing up alongside turtles, pelicans and porpoises. But now, with sea levels rising, their home is at risk of being swept away. Determined to save the land, Eliza and her younger sister Avery secretly go searching in the swamp for the dangerous, wolf-like loup-garou. If they can prove this legendary creature exists, they’re sure that the government will have to protect its habitat – and their community. But there’s one problem: the loup-garou has never been seen before. And with a tropical storm approaching and the sisters deep, deep in the swampland, soon it’s not just their home at risk, but their lives as well.