In this espionage drama, a Secret Service agent must discover who has been smuggling British arms into China. The prime suspect is a prosperous Chinese merchant-philanthropist and the agent thinks the merchant is working with the notorious Chinese guerilla warlord General Ling.

Out of love, young Corinna follows the plantation owner Mannsfeld to the Far East - where she has to realize that he is already married. A small consolation for her is the fact that Mannsfeld is not about a womanizer, but that he is serious about his love for Corinna. The only thing standing in the way of this love is his wife, who, despite the broken marriage, does not want to let Mannsfeld go. When the wife is murdered, this crime seems to bring dubious happiness to the two of them - but it doesn't last long.

Soviet authorities are making life as difficult as possible for a village of Volga Germans, most of whose ancestors originated in the Frisian Islands, with taxes and other oppression.

Henri Pierson, the chief engineer of a railway line crossing Yunnan in China, must prevent the incessant attacks of a gang of looters.

The evil Dr. Mabuse develops a death ray with which he threatens the world.