The Seal of Gengis Khan, by H. Bedford-Jones (epub/Kindle)
Pulp writer H. Bedford-Jones tackles the terrors and splendor of early 20th Century Mongolia, with an American expedition in search of the treasures of Ghengis Khan, aided by a local “wizard”. Rare manuscripts, exotic animals—it was everything they had dreamed of finding. Until they met bandits and their party was largely slaughtered, they thought only of their return home in triumph. Then, barely escaping with their lives, Jim Patrick and two companions discover they are just at the beginning of their adventure . . .