The Death Jade (Ubiquity)

From publisher blurb: A mysterious client offering a lot of money. A missing Russian noble. An ancient jade said to hold the spirit of the First Sovereign Emperor of China... Through the sordid streets of 1936 Shanghai -- the Paris of the Orient -- the characters follow the footsteps of Count Rusikov, a refugee from the Bolshevik Revolution and archaeologist, to find the legendary Donguin Jade, a priceless artifact of Chinese history. But they are not alone -- Japanese agents, communist assassins, and provincial warlords stand between you and the prize! This adventure is powered by the Ubiquity role playing system and is compatible with Hollow Earth Expedition.