A man wakes up deep inside a cave. Suffering amnesia, he has no recollection of how he came to be here nor of what happened to the man whose body he finds beside him. Tailed by a mysterious creature, he must continue through this strange and fantastic world. Enclosed, Tolbiac has no other option to reach the surface than to use REZO ZERO, secret observing cells in this cemetery-like abandoned mine. He embarks upon this journey guided by the roots of a plant, leading the way and the main subject of attention of the REZO. This is the story of the rise of a forgotten man, sometimes informed by the archives of abandoned laboratories, which punctuate this subterranean network and at other times by his own strangely amplified instinct. During his search for the surface, Tolbiac must uncover the secret of what once lived in this network; but has this “mystery” truly left?