Two police inspectors track down a mysterious criminal who signs his crimes with a fiery triangle. When they have just discovered an accomplice, one of the police officers, in love with the young girl, is shot dead. His colleague will then have only one goal in mind.
Through the fault of the Leech, Bibi la Puree and her friend Bob find themselves involved in a crime. The judge in charge of the investigation discovers in Bob a relative. He does not send them to prison and welcomes them to his property.
Out of love for his adoptive mother, Carl Brenner allows himself to be accused and imprisoned because of an illegal operation carried out by Doctor Stefan Brenner, the legitimate son of Mrs. Brenner. A few years later, Stefan died of alcoholism and Carl made a name for himself under his name.
Sentenced to 20 years after killing a colleague for revealing that his wife was unfaithful, Sourdier escapes hoping to kill the woman as well.He learns she was true to him and has had a little girl who thinks the father is dead.
The mysterious vigilante Milton has warned Scotland-Yard of his intention to kill the lawyer Maurice Meister who is the cause of his sister's suicide. Police and detectives watch over the lawyer's home, but on the day and at the appointed time Meister is murdered.
