A Light in the Fog is the fourth expansion in The Inssmouth Conspiracy campaign for Arkham Horror: The Card Game.

Ever since you first woke up in a dank and gloomy tidal cave, you've been trying to put together the loose pieces of your shipwreck memories. You've learned part of what brought you to Innsmouth, and you've battled the evil rising from the ocean floor... but as you escape the Deep Ones flooding Innsmouth and run to the Falcon Point Lighthouse, you find you are on the threshold of the next mystery. Who first captured you and left you for dead? The lighthouse keeper can hide the answers you seek.

As the next chapter of your evolving story, A Light in the Fog expands your adventures in Innsmouth with Arkham Horror: The Card Game, picking up where your frantic car chase left off at the end of Horror in High Gear , and new revelations emerge as you delve deeper into the heart of the tangled conspiracy that surrounds Innsmouth. Along with a new scenario, this expansion, the fourth Mythos pack in The Innsmouth Conspiracy cycle, brings new options to your decks with a slew of new mid-level cards to shape and improve your deck as you gain experience. But as your experiences unlock new abilities, do they also open the door to deeper nuances of madness?