This documentary unravels a unique architectural mystery in Petra: Why do hundreds of carved rock facades feature an unshaped rock mass on their left? What secret lies behind their preservation despite the Nabateans' sculpting mastery? The "Blessing Rock Theory" offers surprising answers about the construction rules, types, and exceptions of these rocks-such as the flattened right facade of the Treasury, unlike all other Petra monuments. The film also decodes the hidden message behind the seemingly random clustering of structures and the choice of specific sites like the Triumphal Arch, revealing how the Nabateans transformed rocks into an architectural cipher carrying enigmatic religious and cultural meanings.