Jean Devalde

When an unscrupulous banker ruins his family, a young man swears to bring him to justice, so he adopts a new identity, the mysterious Judex, and ominously disguised and sunk into the muddy path of vengeance, punishes the crooks and protects the innocents. (Originally a twelve-part epic serial.)

René Dargelle is asked by a friend to receive a young woman in his place. She is soon to marry a Hindu prince, a man who is certainly attractive, but who cheats on her shamelessly and whom she dreams of making jealous. When Dargelle, out of pure fantasy, asks her to tell right and left that he seduced her, she sees the perfect opportunity to infuriate her noble lover.

A young inventor is kidnapped to force him to tell the secret of his invention, but he foils his captors thanks to a pen with invisible ink.