In a secret valley, in the heart of the Tibetan Plateau, lives a mythical and fascinating animal: the snow leopard. Two nature photographers brothers follow its track. Altitude, bitter cold, steep relief: The extrem conditions they are facing do not alter the determination of these two brothers, who are set on observing and taking pictures of this particularly fearful cat. In this wild territory where shepherds live in harmony with nature, they embark on this unique adventure, which will turn into a thrilling photographic hunt on the "roof of the world".