This is such a stupid film that I kept falling asleep during it and had to watch it in three parts. It had to be considered stupid even in the time period in which it was produced.
I had never heard of Ann Corio before watching this film. As it turns out, she was a famous stripper who also made a few films. Corio plays a woman whose parents died in Africa when she was young, leaving her to be raised by a guardian who was an associate of her parents. Although her parents and guardian spoke English, she apparently learned to only speak broken English. She of course also becomes a skilled she-warrior for whom the native Africans have great respect, because none of them can beat her. Didn't I say it's a stupid film?
Buster Crabbe enters the jungle siren's domain and easily convinces her to help him fight the German agents in the area and the natives that have allied with them. That's the plot.
By now you should be grasping the ridiculousness of this story, thus not really requiring me to go any further.