While faking illness to get off work, Philippe tries to decode a red booklet that he lifted from the Grand Inquisitor’s body, which contains the crimes of the Vampires. He discovers that his house is under surveillance by the Vampires, so he leaves in disguise. Following clues in the booklet he arrives at “The Howling Cat” night club. Performing there is Irma Vep (Musidora), whose name Philippe sees is an anagram for vampire. After her act, the Grand Vampire assigns Irma to retrieve the red booklet. As Philippe returns home Mazamette arrives, along with a poison pen he stole from the Grand Vampire. A few days later, Irma arrives at their house disguised as a new maid, but Philippe recognizes her. She tries to poison him, but fails. His mother (Delphine Renot) leaves to meet her brother after receiving word that he has been in a car accident, but it turns out to be a trap and she is captured by the Vampires. While Philippe is asleep, Irma lets another Vampire into his home but he shoots them. They escape, however, because his gun was loaded with blanks. In a shack in the slums, Philippe’s mother is held by Father Silence (Louis Leubas), a deaf-mute, and is forced to sign a ransom note, but she kills him with Mazamette’s poison pen and escapes.