Two young friends from England set off on a journey along the impassable paths of the Udan Mountains. Here, far from civilization, a young Englishman named William, under random circumstances, meets a mysterious and amazing creature - a young Chinese woman of wondrous and unusual beauty, leading a wild lifestyle. From this moment on, William and his friend find themselves in a network of cycles full of mystery and danger, through which they will have to go in order to unravel the complicated and sad fate of the girl.