Call of Cthulhu: Innsmouth is the definitive guide to the decaying port and describes its secret inhabitants, declining businesses, and hidden mysteries. For adult readers: it contains themes intended for adults and is meant for adult players. This supplement is part of the Arkham Unveiled series and is designed for use with the Call of Cthulhu roleplaying game and, optionally, with the Pulp Cthulhu supplement, both sold separately.

A sandbox-style campaign setting that describes the entire town of Innsmouth, including hundreds of locations to explore. Over 80 detailed NPCs for players to encounter, each with their own unique story. Extensive street maps and floor plans of key locations throughout the town. New spells and tomes for players to discover during their investigations.