Not a standalone product. A copy of the Arkham Horror: The Card Game core set is required to play.

Under the waves, an ancient civilization thrives, and a conspiracy brews. Only those outsiders who have heard the whispers of the deep can brave the maelstrom and discover the secrets of the abyss.

The Innsmouth Conspiracy Investigator Expansion for Arkham Horror: The Card Game features five investigators and contains all of the player cards and customization options featured in the original The Innsmouth Conspiracy cycle of products. Grant blessings as the nun, Sister Mary; learn and practice various fields of study as the student, Amanda Sharpe; watch from the shadows as the spy, Trish Scarborough; perform arcane tricks as the magician, Dexter Drake; and brave the open seas as the sailor, Silas Marsh.

The Innsmouth Conspiracy Investigator Expansion can be used to build or enhance investigator decks for any Arkham Horror: The Card Game scenario or campaign.