"Berlin: The Depraved City" is a supplement for the role-playing game Call of Cthulhu that immerses players in the decadent and turbulent Berlin of the 1920s. Amidst corruption, hedonism, and political turmoil, the Cthulhu Mythos intertwines with the plot, giving rise to occult organizations, strange sects, and dark knowledge. The book provides an overview of the city, guides for creating characters and introducing investigators to the setting, details about the criminal underworld, unique cultural and artistic elements of the time, and three thrilling adventures that unfold in the historical context of Berlin. The investigators will have to confront sinister forces and unravel mysteries as the city hurtles towards its dark destiny, challenging their own sanity in the process."