Instead of enjoying her vacations in a peaceful peninsula of Turkey, Anna feels stuck in a strange torpor, while her boyfriend, Thomas, doesn't seem to notice it at all. Later in the afternoon, when a little girl suddenly disappears on the beach, Anna awakens and decides to go and find her, despite the unknown and the nightfall.
In a film consisting entirely of fictitious found-footage, we discover how a young activist, Ulysse, provokes a nationwide cataclysm by stealing a micro-organism developed by a state laboratory: the "mycelium". This microorganism has the ability to degrade all metals and their components, and its spread would risk taking the whole of civilization back to the Stone Age.
