Scanning Google Earth, a researcher named Christophe spots something odd in the middle of the Sahara: twenty-two circles, each about 42 meters across, spaced with eerie regularity roughly 420 meters apart. The film follows the effort to figure out what put them there, weighing natural explanations against human ones and showing the satellite imagery that started the puzzle in the first place. Investigators consider erosion patterns, geological formations, and the possibility of ancient human construction, checking each theory against the circles' precise spacing and size, which seems too consistent for pure chance but leaves no obvious trace of tools, settlements, or purpose on the ground. The desert setting itself becomes part of the mystery, a landscape empty enough that whatever made these marks left them undisturbed for who knows how long. Without a firm conclusion, the film stays honest about the limits of remote-sensing detective work, ending with the circles still asking their question rather than answering it.