In 2002, French adventurer Evrard Wendenbaum saw the Makay Massif on a television nature program and became fixated on the place, a labyrinth of canyons in central Madagascar so remote and inaccessible that it had barely been studied. Five years later he became the first person to cross it alone, and this film follows the expeditions that grew out of that crossing, as he returns with scientists and local guides to document what the canyons hold. The footage moves through narrow gorges, forested plateaus, and river systems cut off from the surrounding plains, turning up rare lemurs, endemic plants, and archaeological remains left by earlier inhabitants. Alongside the discoveries, the crew finds evidence of deforestation and hunting pressing in on the massif's edges, which turns Wendenbaum's fascination into something closer to a conservation campaign. Interviews with him and the researchers he brings along carry the narration, tracking how a single obsessive crossing became an argument for protecting one of Madagascar's last untouched landscapes.