After seventeen years in prison, the former respected Parisian banker Paul Lavond flees with his friend, the lunatic scientist Marcel that is researching with his wife Malita the miniaturization of animals and human beings to improve the resources of mankind. Paul Lavond was framed for robbery by his scoundrel associates Emil Coulvet, Charles Matin and Victor Radin that had stolen his business while his family was doomed to shame, poverty and tragedy. When Marcel reduces the retarded servant Lachna, he learns that the woman is motionless and only responds to the control of his brain and has a heart attack. After the death of Marcel, Paul Lavond sees the chance to use the miniaturization process as instrument of vengeance and he travels to Paris with the insane Malita disguised of Madame Mandilip, a nice old lady and owner of a dolls store. Paul Lavond, using the identity of Madame Mandilip, befriends his resented and estranged daughter Lorraine Lavond and plots a scheme to revenge and vindicate his family name.
Righteous district attorney Joseph Foster's main goal in life is to rid his city of the gangsters infesting it. In order to be even more efficient in his war against crime he plans to run for governor. One day he meets a strange, shadowy man, Nick Beal, who offers to help him to achieve his end. Beal convinces hesitating Foster by dint of easy money, easy sex with an alluring young woman and the promise of easy success. Joseph Foster soon becomes an influential politician but a corrupt one. A minister of God manages to show him that he has been the plaything of the so-called Nick Beal, who might be Old Nick , that is to say Satan himself. Foster then decides to resign and to become an honest man again.