In this sequel to the original story, Monte Cristo count Edmund Dantes (Martin Kosleck) returns to Paris to get revenge but soon finds himself pursued by a cruel policeman. The count's brave wife Haydée throws the cop off her husband's scent by dressing up as the masked avenger herself and proving that she too is most competent with a sword.

William Warner is a lawyer who is famous for his skill at opening any kind of lock, making him a valuable commodity. William is unknowingly enlisted by German spies who want him to open a chest containing a secret formula. This leads to a madcap adventure involving spies, the police and lots of picked locks!