From the liner notes

In a secret camp in Nazi Germany, cruel experiments are conducted for "the selection and improvement of the Race." Female prisoners are forcibly mated with German soldiers and subjected to strange sexual tests. Nazi Sergeant Kruber falls in love with a camp inmate, the lovely French prostitute Mirelle. When Kruber is forced to participate in a perverse operation ordered by the camp's commandant, the Sergeant joins forces with the female inmates to exact revenge on their sadistic overlords.