Favraux, an unscrupulous banker, receives a threatening note, signed by "Judex", demanding that he pay back the people he has swindled. He refuses, and apparently dies after a midnight toast at his masked ball. However, he is only drugged by Judex and locked away. Judex spares his life when the banker s widowed daughter, Jacqueline, rejects the inheritance. Meanwhile Diana Monti, the former governess, kidnaps Jacqueline to try to get the banker s money. But Judex is hot on her trail.