La Mirambelle is an integral reserve, a vast natural park that serves as a laboratory space for specialists who analyse how nature lives and evolves without humans. This reserve, forbidden to man, is, basically, protected naturally, because it is difficult to access; even Alex and Angelo never came there. However, it is in the heart of this protected paradise that we find one morning the body of the young guardian of the reserve, his skull fractured; He lived alone and isolated in a small refuge on the edge of a high-altitude lake in the protected area. Anna, the creator of the reserve, and 4 scientists on a mission were the only people supposed to be in this huge area cut off from the outside world.....until today. And so begins a very strange investigation.