This expansion for Arkham Horror invites you to deepen your adventures with a host of eerie new content. You'll find four new investigators ready to join the fight against cosmic horrors, including Winifred Habbamock the Aviatrix and Agatha Crane the Parapsychologist. Three new scenarios guide you through the unknown realms of the Mythos, where you'll confront ghosts from Arkham's past. Your journey takes you to unseen worlds, from the gabled heights of French Hill to the chilling Underworld, a realm teeming with monsters and madness. Along the way, you'll discover dangerous thresholds that act as gateways to otherworldly locations, each with its own unique perils.