Underground, Overground: The Case File Collection, contains four case files for Rivers of London: the Roleplaying Game, each set in the United Kingdom’s bustling capital city. This book also contains new spells and guidelines on how to create a talking fox investigator!

An exclusive piece of microfiction by Ben Aaronovitch, “The Absolutely True and Accurate Account of How the Foxes Got Their Voices Back.”
Going Underground: the investigators are asked to look into strange occurrences at a fabled “ghost station” on the London Tube system.
The Font of All Evil: a gruesome murder in South Ealing draws the investigators into a tale of dark obsession set in the world of mudlarking.
The Goat-Man is Coming!: following up on a potential mugging in an urban nature reserve turns out to be far more complicated than the investigators expected.
Jimmy’s Last Dance: the investigators must navigate the murky world of greed and betrayal within families if they are to save an old woman from deportation.
New spells, creatures, and the talking fox character creation rules.
Underground, Overground: The Case File Collection requires the Rivers of London: the Roleplaying Game to use .