Geza is a seventeen-year-old Tibetan boy living in mountain village in Shangri-la. After raising wild horses all his life, he has earned the nickname “mustang” as the fastest runner among his countrymen. One day, his sister Gerui has a fall and is seriously injured. Her life is in great danger if she does not receive an operation on her heart. Despite the prohibitive cost of the operation, Geza makes an impetuous, determined decision to save his sister’s life. With time running out, how can he beat the odds to save his sister? This is a heartrending tale that could only happen in the magical world of Shangri-la.