A crazed scientist planning to rule the world decides to destroy the city of Paris with his lightning/ray gun.
The local building-contractor Martin Roumagnac is fascinated by the fashionable Blanche Ferrand. To impress Blache, Martin presents her with a villa. However, this ruins him financially. Despite Martin's many efforts for the now femme-fatal Blanche, she is not able to chose between him and the rich consul De Laubry.
Jérôme owns a boat with his crook of an uncle, La Rose de la Mer. They sail with a band of crooks hired by the uncle to scuttle the ship and collect the insurance premium.
