It is the height of the Roaring Twenties – a fresh enthusiasm for the arts, science, and exploration of the past have opened doors to a wider world, and beyond… And yet, a dark shadow grows in the city of Arkham. Alien entities known as Ancient Ones lurk in the emptiness beyond space and time, writhing at the thresholds between worlds. Occult rituals must be stopped and alien creatures destroyed; before the Ancient Ones make our world their ruined dominion. Only a handful of investigators stand against the horrors threatening to tear this world apart. Will they prevail?