Strange and mysterious sightings send Arkham Investigators to explore the decrepit town of Innsmouth where horrors beneath the sea have risen to consume the world in this new action-adventure gamebook set in the popular world of Arkham Horror. Welcome, Investigator! Innsmouth is awash with sightings of a mysterious sunken pirate junk near the treacherous Devil Reef. Those rumors are an irresistible lure, drawing the Investigators of Arkham to the fog-laden Massachusetts town. But the thrill of discovery quickly wanes when you are faced with hostile locals, a missing marine archaeologist, and a family curse with tendrils that haunt your waking days. Solve the riddles, overcome tests, and wish for luck as you navigate the rotten streets of the decrepit town and beyond to save the world as you know it. However... choose wisely, Investigator, for betrayal lurks around every corner and the path you choose might awaken horrors from beneath the sea to sink us all.