Bianca, an ecologist who was preparing an environmental report on the future of the Ebro Delta, has disappeared. In the river they have found his backpack and the computer with which he worked. It has become useless and there is no trace of it. The police investigate, but find no clear clue to hold onto. Julia, a journalist, and Meri, a fisherwoman, are the only ones who search for her relentlessly. Together they travel the geography of the Delta and discover the characters that populate it As they enter the human ecosystem of the place, male hostilities increase. In addition, concern about the future of the Delta disturbs the environment. Too many economic interests depend on the results of Bianca’s report and everyone seems to have something to hide.