Scattered across Tibet's mountain valleys stand hundreds of stone towers, some carbon-dated to between 500 and 1,100 years old. The film draws on the fieldwork of French explorer Frederique Darragon, who has spent years surveying and dating these structures after professional archaeologists largely left them unstudied. Many towers exceed 60 meters, built without mortar and standing through centuries of earthquakes and weather. Rather than the plain rectangular footprint common to defensive architecture elsewhere, a large number are built on a star-shaped floor plan, a design choice that adds structural strength and remains unexplained in written records. The film lays out the leading theory: that the towers were not military but social, raised by prosperous families to display standing within their village rather than to defend it. No inscriptions survive to confirm why building stopped, and the film treats that gap plainly, presenting the star pattern and the height records as the hard evidence, and the prestige theory as the best available reading of them.