Vicious Villains is a true crime podcast about murderers, told by host Ally Porter. It is built around individual cases. Titles such as Belle Gunness and Keith Gibson are just a name, and that is how the show is organised: one killer, one story. Porter works the same way each time. She likes to open with background, meaning a killer's upbringing and early offences, because she thinks it brings the whole story together. Only then does she move on to the killings, the investigation and what the evidence showed. The Keith Gibson episode follows that path, from his early crimes through a series of parole arrangements to the shooting of a store clerk in Delaware. The cases come from many eras. Belle Gunness goes back to a La Porte farmhouse that burned in 1908, to letters urging a man to come there with money and keep it a secret, and to remains later found buried on the property. The William Heirens episode covers the ransom calls made to the Degnan family. With Charles Cullen the setting moves into hospitals. Porter traces a pattern of short stays at one workplace after another and notes how a national nurse shortage kept him employed. Alongside the solved cases runs Anonymous Assassins, a numbered strand marked AA in the episode titles. It is set aside for unsolved crimes, where Porter can talk through theories and what may or may not have happened. In AA5. Jack The Ripper she sets out the debate over whether the canonical five victims belong to one killer, including the idea that two of the murders were a copycat's work. In AA6. The Murder of JonBenét Ramsey she goes through the forensic details, from the cord and paintbrush found at the girl's neck to the DNA profile of an unknown male. She calls it a general overview of a case with many more details left over. Her delivery is plain and conversational. Asides break into the narration: about one hospital death that was never conclusively tied to Cullen, she says 'we know'. Episodes close with an invitation to share theories or suggest future cases on Facebook and Instagram, followed by a reminder to stay safe. In one sign-off she explains why she tells these stories: true accounts, good or bad, give people lessons they can apply to their own lives to feel safer. For a first listen, Belle Gunness shows the standard format, and either Anonymous Assassins episode shows the theory-driven side.