Provavelmente "Telhado do Mundo" no vol. 1 das aventuras dos cossacos - Lobo das Estepes, de Harold Lamb
Resumo extraído de aqui :
The Dalai Lama sends an envoy to the Tatars, offering them help in their fight against the Kallmarks if Khlit, the Wolf, will come to the citadel of Talas, near Jallat Kum on the border of the Taklamakan desert. Khlit decides to go alone, and leaves the khans behind. Chagan, the sword bearer follows him and they reach Talas together, where they meet Shellil, a Kirghiz dancer, and Azim, a shepherd. The Dalai Lama’s messenger meets them at Talas and takes them to Kashgar, where the Kirghiz chiefs Iskander Khan and Bassangor Khan are coming. The head of the lamasery, Dongkor Gelong, is playing both ends against the middle. Caught between the lamas and the Kirghiz, in a hostile place where he is a prisoner in all but name, what will Khlit do?