From publisher blurb: Isle of Madness is a hair raising 1930's Pulp Cthulhu scenario taking place on a secret island hidden in the North Atlantic Ocean—an island occupied by terrible fish-man amalgams, referred to as devilfish due to their strange red coloring, and a mad scientist intent on mastery of everything below the surface of the seas. This is a short scenario suitable for up to six players. This scenario can be run as a introductory scenario for a new group or as a side-trek for an established group of heroes between chapters of a campaign.